Thursday, August 30, 2007
Uncovering the Facts about Sunscreen
Since I extended the offer to disburse free samples of Blue Lizard Australian Sunscreen out, many individuals across the country have taken me up on the offer. And, as such, I have received numerous questions about sunscreens (not to mention 100% positive feedback about Blue Lizard).
My recent Blog entry - Maximizing Sunscreen Efficacy, discusses what ingredients to look for, and how to ensure you're getting optimum protection. Yet, here is a list of commonly asked questions about sunscreens that many people ask:
1. Who needs to use sunscreen?
In a word -- EVERYONE~ Regardless of skin color or skin type, everyone needs sunscreen! The Food and Drug Administration (FDA) and the American Academy of Dermatology recognize six different skin types.
I. Always burns easily, never tans, is extremely sun sensitive skin. Red-headed with freckles. Irish/Scots/Welsh.
II. Always burns easily, tans minimally, is very sun sensitive skin. Fair-skinned, fair-haired, blue or green-eyed. Caucasians.
III. Sometimes burns, tans gradually to light brown, is moderately sun sensitive skin. Average skin.
IV. Burns minimally, always tans to moderate brown, is minimally sun sensitive Mediterranean-type/Caucasians.
V. Rarely burns, tans well, isn't sensitive to the sun. Middle Eastern, some Hispanics, some African-Americans.
VI. Never burns, deeply pigmented, isn't sun sensitive. African-Americans.
The American Academy of Dermatology suggests that, regardless of skin type, a broad-spectrum (protects against UV-A and UV-B rays) sunscreen with a Sun Protection Factor (SPF) of at least 15 should be used year-round. (Ideally SPF 30). Remember, everyone is at risk for skin cancer!
2. When should sunscreen be used?
Sunscreen should be used every day (even on cloudy and cold days) if you are going to be outside for more than 20 minutes, and should be reapplied every two hours. Daily, regular use of SPF 15 sunscreens actually allow some repair of surface-level damage to the skin (i.e, wrinkles and premature aging). It is important to properly apply sunscreen and to reapply it daily. The sun’s reflective powers are great – 17% off of sand and concrete; 80% off of water and snow. And remember that even on a cloudy day, 80% of the sun’s ultraviolet rays pass through the clouds.
3. How much sunscreen should be used, and how often should it be applied?
Sunscreens should be applied to dry skin at least 20 minutes before going outdoors. When applying sunscreen, pay particular attention to the face, ears, hands and arms, back of the neck, and tops of the feet, and be coat the skin liberally. One ounce (enough to fill a shot glass) is the amount needed to adequately cover the exposed areas of the body properly. Be careful to cover exposed areas completely – a missed spot could mean a patchy, painful sunburn. And don’t forget that lips get sunburned, too! Be sure to apply a lip balm that contains SPF of 15 sunscreen. Sunscreen should be re-applied every two hours, and they should be reapplied after swimming or perspiring heavily. Even so-called water resistant sunscreens may lose their effectiveness after 80 minutes in the water. Don’t forget that sun exposure occurs all the time, even while you’re taking a short walk on a cloudy day. (For children six months an older, reapply sunscreen every 1 - 1.5 hours if in the sun during the peak hours of 10:00 a.m. and 4:00 p.m.).
4. What type of sunscreen should I use, and what ingredients should I look for?
There are so many types of sunscreen that selecting the right one can be quite confusing. Sunscreens are available in many forms including ointments, creams, gels, lotions and wax sticks. The type of sunscreen you choose is a matter of personal choice. Ideally, sunscreens should be rated at an SPF of 15 or higher (SPF 30 is the best) and provides broad-spectrum coverage against both UV-B and UV-A rays. Ingredients which provide broad-spectrum protection include; titanium dioxide, zinc oxide, benzophenones (oxybenzone), cinnamates (octylmethyl cinnamate and cinoxate), sulisobenzone, salicylates,and avobenzone (Parsol 1789). (*Note: According to Australian standards, which are considered the strictest in the world, the best protection ingredients include a minimum 5% of titanium dioxide and minimum 5% of titanium dioxide).
5. Can I use the sunscreen I bought last summer, or do I need to purchase a new bottle each year? Does it lose strength?
Unless indicated by an expiration date, the FDA requires that all sunscreens be stable and at their original strength for at least three years. Though, most dermatologists and skin cancer educators recommended replacing your sunscreen every year. Keep in mind that if you are using the appropriate amount of sunscreen every day (and reapplying it) a bottle of sunscreen should not last you very long. Approximately one ounce of sunscreen (enough to fill a shot glass) is considered the amount needed to cover the exposed areas of the body properly.
6. What is the difference between UV-A and UV-B (ultraviolet) light wavelengths and will a sunscreen protect me from both?
Sunlight consists of two types of harmful rays – UV-A rays and UV-B rays. The UV-B rays are the sun’s burning rays and are the primary cause of sunburn and both basal-cell and squamous-cell carcinomas (the two more common forms of skin cancer). UV-A rays penetrate deeper into the dermis (the base layer of the skin). UV-A are the more the more dangerous, as they can penetrate through window glass, and are primarily responsible for melanoma--the deadliest form of skin cancer. Both UV-A and UV-B rays can cause suppression of the immune system which helps to protect you against the development and spread of skin cancer. Since PABA and PABA esters only protect against UV-B rays, use a broad-spectrum sunscreen that also protects against UV-A rays. Ingredients like titanium dioxide and zinc oxide extend the coverage beyond the UV-B range and into the UV-A range, thus providing broad-spectrum protection.
7. What is an SPF?
SPF stands for Sun Protection Factor. Sunscreens are rated, or classified, by the strength of their SPF. The SPF numbers on the packaging can range from as low as two to greater than 30. These numbers represent the ability of a sunscreen formula to deflect ultraviolet radiation. Yet, keep in mind, that SPF 30 is considered ideal. (Technically, sunscreens rated higher than SPF aren't molecularly more potent). If you consider that a SPF 20 is preventing 95 out of every 100 UV protons from reaching your skin, then a SPF 30 is providing about 95-98% worth of protection. The sunscreen SPF rating is calculated by comparing the amount of time needed to produce a sunburn on sunscreen protected skin to the amount of time needed to cause a sunburn on unprotected skin. Dermatologists strongly recommend using a broad-spectrum sunscreen with an minimum SPF 15 year-round for all skin types.
8. Does SPF 30 have twice as much sun protection as SPF 15?
SPF protection does not actually increase proportionately with a designated SPF number. In higher SPFs, such as an SPF of 30, 97% of sunburning rays are deflected, while an SPF 15 indicates 93% deflection. (A SPF 5 provides less than 50% protection). Note: Research reported by the AAD suggests higher SPF sunscreens (such as SPF 15 or SPF 30) are an appropriate choice for very sun sensitive individuals (skin types I and II). One study determined that skin protected by an SPF 15 sunscreen and then exposed to 15 times the minimum dose of sunlight normally required to cause redness produced 2.5 times the number of sunburn cells seen in SPF 30 protected skin with the same dose of sunlight. These results suggest that prevention of redness does not necessarily mean prevention of all sun-induced damage. More research is currently underway on the protective effects of sunscreens on different skin types.
9. What is the difference between a sunscreen and a sunblock?
Since sunscreens can now either chemically absorb UV rays, or deflect them, the term sunblock is no longer used. (The term "sunblock" is a misnomer). It’s important to find a sunscreen that offers both UV-A and UV-B (broad-spectrum) protection and includes ingredients such as titanium dioxide and zinc oxide.
10. Is sunscreen application all I need to do to protect myself from the sun?
Because overexposure to ultraviolet light is the primary cause of melanoma, dermatologists recommend the following precautions:
• Avoid the being in the sun during the peak hours of 10:00 a.m. and 4:00 p.m. when the sun’s rays are the strongest.
• Seek shade whenever possible. Remember: "No shadow…seek the shade!" If your shadow is shorter than you are, the damaging rays of the sun are at their strongest and you’re likely to sunburn.
• Apply a broad-spectrum sunscreen with a minimum SPF 15; apply it 20 minutes before going outdoors and reapply every two hours, especially when playing, gardening, swimming or doing any other outdoor activities. Sunscreens should not be used to increase the time spent in intense sunlight or instead of protective clothing.
• Wear sun protective protective clothing (rated at a UPF 50+) including a wide-brimmed hat, and wrap-around UV protective sunglasses.
Note: A number of studies have confirmed that repeated sunburns substantially increase the risk for melanoma skin cancer. This is especially true for childhood sunburns because there is more time and opportunity for subsequent sun damage to lead to melanoma.
11. Is there a safe way to tan?
There is NO safe way to tan! A tan is the skin’s response to an injury. Tanning occurs when ultraviolet rays penetrate the skin’s inner layer, thus causing the skin to produce more melanin as a response to the injury. Chronic exposure to the sun results in a change in the skin’s texture causing wrinkling and age spots. Thus, tanning to improve appearance is ultimately self-defeating. Every time you tan, you accumulate damage to the skin. This damage, in addition to accelerating the aging process, also increases your risk for all types of skin cancer, including melanoma.
12. Are tanning booths a safer way to tan?
Again, there is no such thing as a safe tan. In spite of claims that tanning booths offer "safe" tanning, artificial radiation carries all the risks of natural sunlight. Tanning booths emit UV-A radiation, which poses both short and long-term risks to the skin, including cataracts (eye damage), sunburns, skin cancer and premature aging. In addition, there can be damage to the body’s immune system and induce allergic reactions to certain fragrances, lotions, moisturizers and medications. Many tanning salons are unregulated, allowing customers access to tanning beds without supervision or even eye protection. The American Academy of Dermatology supports local and/or statewide indoor tanning legislation that bans minors from using tanning devices. In addition, this legislation usually requires that warning signs be prominently displayed in tanning salons and list the hazards of such exposure, among other possible regulatory provisions. We also support legislation regulating minors' use of tanning beds.
13. How do I treat a sunburn?
There are several types of sunburns (ranging from first to third degree burns) and burn treatments. Remember, that while you may not immediately see the effects of overexposure to the sun the cumulative effects do significantly increase your risk for skin cancer. The two most common sunburns are first-degree burns and second degree burns. First-degree sunburns cause redness and will heal, possibly with some peeling, within a few days. These can be painful and are best treated with cool baths and moisturizers or over-the-counter hydrocortisone creams. Avoid the use of "-caine" products (such as benzocaine), which may cause sensitivity to a broad range of chemicals. Aspirin taken orally may lessen early development of sunburn, but should not be used in placement of regular sunscreen use. Second degree sunburns blister and can be considered a medical emergency if a large area is affected. When a burn is severe, accompanied by a headache, chills or a fever, seek medical help immediately! Be sure to protect your skin from the sun while it healsm and everyday thereafter. That said, let it be re-stated that studies have found sunburns are linked to an increased risk for melanoma, especially if you suffered severe childhood or adolescent sunburns. Just one blistering sunburn as a child can nearly double your risk for skin cancer as an adult.
14. How much sunscreen should I apply to my skin each day to make sure I am covered?
Considered the country’s authority on the proper use of sunscreens, Dr. Elma Baron of Case Western Reserve University in Cleveland, Ohio, strongly recommends using an ounce of sunscreen (or the equivalent to the amount that would fit into the palm of your hand). With that, it is imperative to remember to apply sunscreen on EVERY part of your body that is [potentially] exposed to UV rays. Places such as your ears, behind your neck, your back, the backs of your calves, your toes, are all places that are commonly neglected. If you have trouble reaching certain parts of your body, get your spouse or your best friend to help you apply sunscreen. Make it a team effort to protect each other from the sun!
15. Which sunscreens on the market today are best for my budget?
Dr. Sancy A. Leachman, deputy director and principle investigator at the Tom C. Mathews Jr. Familial Melanoma Research Clinic at Huntsman Cancer Institute in Salt Lake City, Utah, has put together an exhaustive and accurate spreadsheet that lists every sunscreen product imaginable; lists them by the amount of essential protective ingredients each products incorporates in its sunscreen formula, the level of SPF it provides, and how much the product cost per ounce in comparison to its competitors. To reference Dr. Leachman’s An Ounce of Prevention sunscreen spreadsheet, send an email to email@example.com or contact Dr. Leachman at Huntsman Cancer Institute at 2000 Circle of Hope in Salt Lake City, Utah.
16. Are men or women better about regular sunscreen usage?
It is interesting to note results from a survey conducted by the American Academy of Dermatology in May 2005; the survey reported that teenage boys are the least likely of all Americans to use sunscreen. Only 32%of teenage boys aged 15-to-17 reported taking regular precautions against over-exposure to UV-rays. Similarly, the U.S. Surgeon General Richard H. Carmona, M.D., MPH, reports that another survey, recently conducted by the Sun Safety Alliance, reflects that sunscreen usage among Americans in their 20s and 30s is decreasing. It decreased from 72% in 2005 to less than 60% today. Additionally, the study reports that despite the fact 85% of middle-aged women know “the dangers of overexposure to the sun and believe skin cancer is a serious issue" they fail to properly and regularly use sunscreen. In fact, more than 60% of Americans suffer at least one blistering sunburn ever year. This is not only perplexing, but concerning especially since at least 90% of skin cancers are caused by over-exposure to ultraviolet radiation!
17. I want to remember to use my sunscreen – Do you have any ideas on how I can do that?
We have several ideas about how to incorporate a regular practice of proper sunscreen usage so as to foster a permanent lifelong habit. To mention a few:
Consider placing a bottle of sunscreen in your make-up bag or by your bathroom sink (right next to your toothbrush/toothpaste). Consider getting a bottle of sunscreen that has a key ring on it and fastening it to your house and/or car keys. Put post-it notes on your mirrors or on the front door that read: STOP! Put on your sunscreen right NOW! until it becomes so that you don’t even have to “think” about it because you are doing it all the time anyway; it becomes automatic… it becomes a habit! You can also tell your room-mates, your friends, or your loved ones, to give you friendly reminders. (Be aware that these little friendly reminders may seem annoying, but just remember you asked for it!)
18. Does sunscreen, especially sunscreen usage as a child, really reduce your risk for skin cancer?
Approximately, 80% of our lifetime sun damage is sustained during our first 18 years of life, therefore making a habit of daily, year-round sunscreen usage beginning in childhood is good common sense. And, yes, sunscreen use in children can lower one’s risk for skin cancer in the future. “Sunscreen has always been an important part of an overall sun safety regime to protect the number of sunburns, especially for children,” reports dermatologist Jason K. Rivers of the University of British Columbia Department of Medicine. Dr. Rivers conducted a study of 309 Caucasian children ages six-to-10, who were monitored for three years. “Not only did the children in the sunscreen develop less nevi, it is of some significance.” To reference this study, contact the American Academy of Dermatology.
19. Does sunscreen use cause a Vitamin D deficiency?
It is true that our bodies need Vitamin D because it helps with the production of calcium and phosphorus – two minerals necessary for the building and maintenance of strong, healthy bones. However, the sun (or any other form of ultraviolet radiation) is not a viable method of getting your daily Vitamin D. We have mentioned how ultraviolet radiation damages our skin and places at a significantly higher risk for skin cancer, so to justify use of indoor tanning beds or suntanning as a means of getting Vitamin D is not only unnecessary, but dangerous. Americans fortify a majority of their grocery products with Vitamin D – milk, for example. Therefore, if were to have a bowl of cereal every day you would get sufficient Vitamin D. Reiterating this truth is the American Academy of Dermatology. The AAD recently compiled a list detailing reasons not to seek the sun for your daily Vitamin D.
So, there you have it -- the answers to many of your questions about sunscreens. For more information check out ONLY SKIN DEEP? An Essential Guide to Effective Skin Cancer Programs and Resources, or consult a board-certified dermatologist. You can also send me an email at firstname.lastname@example.org
* This list was compiled by the American Academy of Dermatology with additions made by The Cancer Crusaders Organization.
Posted by Danielle at 1:42 PM