Skin & hair tips

Skin care tips from Dr. Knight

The skin issues Dr. Knight sees most, starting with dry skin, and how to choose a sunscreen you will actually wear.

Dry, cracked skinYvonne Knight, MD · 4 min

Sunscreen: chemical vs. mineral

The FDA has found absorption of some chemicals from sunscreens into our bodies beyond the allowed amount of 0.5 ng/ml. Their effect is unknown. The chemicals of concern are avobenzone, ecamsule, octocrylene, octisalate and oxybenzone.

Mineral sunscreens include the ingredients titanium dioxide and/or zinc oxide. When applied, they do not enter the body but absorb UV rays. Chemical sunscreens absorb the UV rays and can be absorbed into the body.

More studies will be done, but in the meantime continue using your sunscreen for protection.

Beyond sunscreen

You can also:

  • Wear clothing and hats made for sun protection
  • Avoid peak UV times of the day, 11am to 2pm
  • Take advantage of shady areas when you can
  • Wear sunglasses that offer UV protection
  • Begin to wear hats if you have thinning or loss of hair

How to choose a sunscreen

Choose a brand with a history in skin care, not sun tanning.
Neutrogena, Aveeno, Elta and Blue Lizard are very reputable companies.
Is this sunscreen for the face or the body?
A less expensive sunscreen can be used on the body with an oily or zinc base.
Is your face oily, dry, normal or combination?
Your sunscreen should leave a matte finish on your face, not oily or too dry.
Are the ingredients natural or in question?
Zinc and iron oxide are organic. Chemicals are a concern, but their safety hasn't been studied yet.
Do you have skin of color?
To avoid a whitish or bluish appearance, the zinc needs to be tinted and micronized. Some of the chemical sunscreens that do not give the bluish appearance are unfortunately under FDA scrutiny at this time. Please ask for the latest information on appropriate and safe sunscreens.

This advice is general and educational. It does not replace an examination or an individual consultation.

Also from Dr. Knight: Hair care tips