Allergic contact dermatitis from δ‐aminolevulinic acid used for photodynamic therapy

Abstract

Photodynamic laser therapy, using topical δxs‐aminolevul‐inic acid (d‐ALA), is a method of treating superficial cancers and precancers (1–5). In this form, the chemical is usually well tolerated (2), which has also been shown in animals (6).