Everything You Should Know About Sunscreen but Probably Don't

We all know that wearing sunscreen is your first defense against skin cancer. Yet, this disease remains the most common cancer in the United States. May is National Skin Cancer Awareness Month, which makes this the ideal time to learn how, how often, and what type of sunscreen to use, as well as the mistakes most commonly made.

Here is everything Robert Mirabile, MD, and  Dr. Vivian M. Hsu of Best Impression Med Spa, in Blue Bell, PA, want you to know about sunscreen that you likely don’t. 

Chemical vs physical sunblock

Not all sunscreens work the same way. Chemical sunscreens act like a sponge. They absorb UV rays, turn them into heat, and release that heat from the skin. Physical sunscreens, often called mineral sunscreens, sit on the skin and act as a shield. They reflect UV rays away. Both are effective, but many patients with sensitive skin prefer mineral options containing zinc oxide or titanium dioxide. Mineral versions are often better for those prone to irritation or heat-related skin issues, such as melasma.

The real scoop on those SPF numbers 

A higher SPF does not mean you can stay in the sun all day without reapplying. SPF 30 blocks about 97 percent of UVB rays, while SPF 50 blocks about 98 percent. No sunscreen blocks 100 percent of UV rays. Most people only apply about 25 to 50 percent of the recommended amount. You need about an ounce, or enough to fill a shot glass, to cover your entire body. If you are only applying a thin layer of SPF 50, you are likely only getting the protection of an SPF 15.

Why broad-spectrum protection is a must

The sun emits different types of radiation. UVB rays cause sunburn and play a key role in the development of skin cancer. UVA rays are the ones that age your skin. They penetrate deeper and cause wrinkles and sun spots. If your bottle does not say broad spectrum, you might be preventing a burn while still allowing your skin to age prematurely. emphasizes that broad-spectrum protection is the most critical factor in preventing long-term damage for our patients in Blue Bell.

Reapply and reapply

Sunscreen wears off. It breaks down when exposed to direct sunlight and can be washed away by sweat or water. Even if you are not swimming, you should reapply every two hours. If you are wearing makeup, there are powder-based SPF options that make reapplication throughout the day easier. Consistent use can actually help your skin repair itself over time because it is no longer fighting constant UV stress.

To find the best medical grade sun protection for your skin type, call our office at 610-272-8821 or request an appointment online. Visit us at our convenient office or book an appointment through our online portal today.