What does sun sensitivity feel like with drug rash?

A drug rash can make exposed skin react more strongly to sunlight. Symptoms may appear on the face, neck, arms, hands, or other uncovered areas and can be more noticeable after time outdoors. The skin may look pink or red, feel hot, or develop small bumps, patches, or blisters. Some reactions affect skin exposed to daylight through a window, while others are triggered mainly by direct sun. The timing of a new medicine, dose change, or combination of medicines can help a clinician assess the pattern.

Reduce direct sun exposure while the reaction is active. Wear closely woven clothing, a wide-brimmed hat, and use shade; ask a pharmacist or clinician whether your medicines can increase light sensitivity. Do not stop a prescribed medicine abruptly unless a healthcare professional tells you to. Keep a note of the medicine name, when it was started, when the skin changed, and which areas were exposed. A clinician may need to examine the rash and review every medicine, supplement, and topical product.

Seek urgent medical help for blistering, peeling skin, severe pain, rapidly spreading redness, sores in the mouth or eyes, facial swelling, breathing difficulty, faintness, or fever with a widespread rash. These features can signal a serious medicine reaction. Contact a clinician promptly if the rash is worsening, involves the eyes or lips, or begins soon after a new medicine.

Which medicine could be contributing to the reaction? Should I change, pause, or replace any treatment? How long should I avoid direct sun, and which protective measures suit my skin? What changes would mean I need same-day assessment?