What should you know about sun allergy pills?

Sun allergy is a broad everyday term. Polymorphic light eruption can cause itchy bumps, patches, or small blisters after ultraviolet exposure, often on skin that was covered during the darker months. A medication, cosmetic, or another light-sensitive condition can produce a different pattern. The timing of the rash, its shape, and whether it returns after sun exposure help a dermatologist sort these possibilities. Review [Sun Sensitivity](/symptoms/sun-sensitivity/) for related symptoms.

A pharmacist or doctor may discuss an oral antihistamine for itch, or another prescription when inflammation or a medicine-related reaction is suspected. Do not combine products with similar ingredients or use someone else’s prescription. Check for drowsiness, interactions, pregnancy considerations, and conditions such as glaucoma or prostate problems before taking an antihistamine. Reduce exposure with shade, clothing, and broad-spectrum sunscreen suited to your skin. If episodes keep returning, a dermatologist may consider [Narrowband UVB Phototherapy](/treatments/medical-dermatology/narrowband-uvb-phototherapy/).

Arrange medical assessment if the eruption is widespread, painful, blistered, infected-looking, or repeatedly returning despite avoiding sun. Seek urgent help for facial swelling, trouble breathing, faintness, or rapidly worsening symptoms. A rash after a new medicine deserves prompt advice because sun sensitivity can sometimes be medication-related.

Ask which diagnosis best fits the timing and appearance, whether an oral medicine is suitable with your current medicines, how long to use it, and what side effects require stopping it. Ask whether [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) would be more appropriate for a limited itchy area.