2 articles
Photo-allergic contact dermatitis
Photo-allergic contact dermatitis (PACD, photoallergic eczema) is a type IV hypersensitivity skin reaction to a light-activated contact allergen, mainly sunscreens and topical NSAIDs, diagnosed by photopatch testing and distinguished from phototoxic dermatitis by delayed onset and sensitization.
Phytophotodermatitis
Phytophotodermatitis, also called lime disease, is a non-immunologic phototoxic skin reaction caused by furocoumarins (psoralens) from plants such as limes, figs, hogweed, and celery, activated by UVA sunlight, causing streaky blisters and lasting hyperpigmentation.