Should I Discontinue Retin-A Use if Exposed to Sun for a Long Period of Time?

For most patients who have been on tretinoin for a long period, tretinoin is generally continued during sun exposure. Exceptions include if (1) you're just starting tretinoin or (2) increasing to a stronger concentration and planning an extended period of sun exposure. Tretinoin induces a variable degree of skin irritation when first starting or changing therapy. The added irritation from extended sun exposure will make your skin especially sensitive. As other dermatologists and skin... more

Retin-a should be applied at night and not in the mornings. There is definitely a warning of photosensitivity with retin-a, however, with newer formulations of retin-a this is usually not a big problem if one is using sunscreen. Furthermore, retin-a inhibits many enzymes that are stimulated by the sun to break down collagen and elastic fibers (matrix metalloproteinases) that cause photoaging, thus using retin-a if you are not suffering from the photosensitivity is an important... more