Does sun allergy cause sun sensitivity?

Polymorphic light eruption is an immune-mediated reaction to ultraviolet exposure. It often affects areas that have recently received more sun, such as the chest, arms, or neck, and the rash can have different shapes across people. Symptoms may appear after exposure rather than immediately and can recur during sunny periods. Medicines, skincare products, and other photosensitive conditions can produce similar reactions, so the pattern and history help guide assessment.

Limit direct midday sun, use closely woven clothing and a broad-brimmed hat, and apply a broad-spectrum sunscreen that suits your skin. Reapply it as directed, especially after swimming or sweating. Avoid deliberately tanning or using tanning devices while the skin is reactive. Cool compresses and a bland moisturiser may soothe discomfort; a clinician can recommend medicines when itching or inflammation is substantial.

Arrange a review if reactions are frequent, severe, spreading beyond exposed skin, or leaving significant colour change. Seek prompt care for facial swelling, breathing difficulty, extensive blistering, fever, or feeling faint. A medicine review is useful if the sensitivity began after a new prescription or topical product.

Ask whether the pattern fits polymorphic light eruption, whether a medicine or product may be increasing sensitivity, which protection is practical for you, and what to do at the first sign of a reaction.