Why is my skin sensitive to the sun?

Sensitivity may show as redness, warmth, stinging, itching, small bumps, or blisters after outdoor exposure. The reaction can be caused by naturally reactive skin, an impaired barrier, an underlying condition, or a medicine or product that increases light sensitivity. Rosacea can flare with heat and sunlight; atopic dermatitis can become more irritated when the barrier is dry; and a rash around the mouth has its own pattern and may be perioral dermatitis. A clinician will consider where the rash appears, how quickly it starts, what it looks like, and whether it occurs through window light or only outdoors.

Use shade, a broad-spectrum sunscreen that your skin tolerates, a hat, sunglasses, and tightly woven clothing. Reapply sunscreen as directed on the product and avoid peak exposure when possible. Introduce new skincare products cautiously, particularly exfoliants and fragranced formulas, and keep the barrier moisturized. Review medicines and supplements with a pharmacist or doctor rather than stopping a prescribed treatment yourself. Photograph a recurring rash and record the product, medicine, heat, and exposure that preceded it.

Arrange a dermatology review if reactions recur, appear after brief exposure, leave lasting marks, or persist away from the sun. Seek urgent help for facial or throat swelling, breathing difficulty, widespread blistering, severe pain, eye involvement, fever, or a rapidly spreading rash. A new reaction after a medicine should be discussed promptly with the prescriber or pharmacist.

Could this pattern fit rosacea, atopic dermatitis, or perioral dermatitis? Could any medicine or product be increasing sensitivity? Which sunscreen and cleanser should I use? Do I need testing or a treatment plan for recurring flares?