When should you see a doctor about sun sensitivity?

Photosensitivity may cause redness, itching, burning, bumps, blisters, or a rash on exposed areas. Photodermatitis can present after light interacts with a product or medicine. Polymorphic Light Eruption can present as an itchy rash after sun exposure. Drug Eruption can present with a widespread rash after a medicine, sometimes involving areas not exposed to light. Cutaneous Lupus can present with sun-sensitive skin changes. A reaction pattern does not establish its cause by itself.

Move into shade or indoors, cover exposed skin with closely woven clothing, and use sun protection that your skin tolerates. Stop using a new fragranced or light-reactive product on the affected area, but do not stop a prescribed medicine without speaking with the prescriber. Record the timing, exposed sites, products, medicines, and whether the rash recurs; photographs taken during a flare can help.

Seek urgent help for trouble breathing, facial or throat swelling, faintness, widespread blistering or peeling, severe pain, eye involvement, or a rapidly spreading rash. Arrange prompt review for fever, mouth sores, pus, marked tenderness, darkening or scarring, or a rash that persists after avoiding sunlight. A new reaction after starting a medicine should be discussed promptly with the prescribing clinician.

Ask whether the pattern resembles Cutaneous Lupus, Drug Eruption, Photodermatitis, or Polymorphic Light Eruption, and whether medicines or products could be contributing. Ask what protection is suitable, whether testing is needed, and how to handle future reactions without interrupting essential treatment unsafely.