Why Sunscreen Is Essential for Acne-Prone Skin

UV Safety Awareness Month is a reminder that sun protection matters for more than preventing sunburn or reducing skin cancer risk. For people managing acne, sunscreen can directly affect how the skin heals and how well certain treatments work, according to Joel Spitz, M.D., a board-certified dermatologist and co-founder and chief medical officer at Honeydew.

Spitz said one of the most common concerns for patients is not the acne itself but the marks left behind after a breakout clears. That is especially true for people with darker skin tones. These marks, known as hyperpigmentation, typically take six months to a year to fade, and sun exposure can significantly slow that process. Melanocytes, the skin cells responsible for pigment production, become overstimulated in areas already affected by hyperpigmentation. UV light exposure prompts those cells to produce even more melanin, deepening the mark and prolonging how long it lingers. Consistent sunscreen use, Spitz said, is the single most effective step patients can take to protect against this.

Spitz also distinguished hyperpigmentation from true acne scarring, a distinction that matters for UV safety guidance. Scars involve physical texture changes, such as indented ice pick scars or deeper atrophic scars. Sunscreen does not reverse this kind of scarring the way it helps fade pigmentation, though unprotected sun exposure can make scars more visually apparent by deepening the contrast between tanned and untanned skin.

Sun safety becomes even more important for patients on common acne medications. Tretinoin, a topical treatment, is applied only at night because sunlight breaks down the molecule and reduces its effectiveness. It also thins the skin’s outer layer, allowing UV light to penetrate more deeply and reach melanocytes, which can increase both pigment production and inflammation. Isotretinoin (Accutane) works similarly from within the body, thinning the skin’s natural barriers as it clears clogged pores, which can leave skin drier, more irritated and more sun-sensitive overall.

The message for UV Safety Awareness Month, Spitz said, is straightforward: Daily sunscreen is not just a general wellness habit. For anyone treating acne or fading post-acne marks, or using medications like tretinoin or isotretinoin, sun protection plays a direct, measurable role in skin recovery and treatment success.