Disappointing results and low tolerability of photodynamic therapy with topical 5‐aminolaevulinic acid in psoriasis. A randomized, double‐blind phase I/II study

Background  Based on good results in the treatment of superficial skin tumours, since the early 1990s topical photodynamic therapy with aminolaevulinic acid (ALA PDT) has been used for disseminated, inflammatory dermatoses including psoriasis. However, there is still a lack of well‐documented trials.

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