What should you know about face sun allergy?

Sun allergy is commonly used for a light-triggered eruption such as polymorphic light eruption. It may produce itchy red patches, small bumps, blisters or burning on exposed areas, often after time outdoors. The rash can recur with later exposure, while covered skin may be spared. The pattern is not diagnostic by itself: a new medicine, skincare ingredient, plant contact, heat, infection or an autoimmune condition can produce similar findings. A clinician will consider timing, distribution, symptoms, medicines and relevant medical history.

Sun sensitivity is a symptom rather than a diagnosis. Keep a record of when the rash starts, which areas were exposed, what products or medicines were used, and how long the eruption lasts.

Move into shade, cover the skin with tightly woven clothing and use a suitable broad-spectrum sunscreen. Keep skincare simple while the rash is active; avoid fragranced products, hot water and scratching. A clinician may recommend a short course of topical corticosteroids for inflammation, with directions specific to the face because facial skin is delicate. For recurrent or difficult cases, narrowband UVB phototherapy may be discussed as a supervised option to build tolerance. Do not deliberately expose a rash to sunlight as a home test.

Arrange assessment if the eruption is recurrent, widespread, painful, blistered, associated with joint symptoms, or does not improve after avoiding light. Seek urgent help for swelling of the lips or tongue, wheezing, faintness, widespread blistering, eye pain or a severe reaction soon after a medicine. These signs can indicate a more serious reaction than a local sun-triggered rash.

Ask whether the pattern fits sun sensitivity, whether a medicine or product could be contributing, which facial treatment is safe, and how to protect your skin during future outdoor exposure.