Contact Immunotherapy-Induced Renbök Phenomenon in a Patient with Alopecia Areata and Psoriasis Vulgaris

The document described a case study of a patient with both alopecia areata (AA) and psoriasis vulgaris who experienced the Renbök phenomenon, where normal hair growth occurred in psoriatic lesions. This phenomenon was first introduced by Happle et al. The exact mechanism behind this phenomenon remained unclear, but the case provided valuable insights into the interaction between AA and psoriasis. The study highlighted the potential of contact immunotherapy in inducing hair regrowth in such complex cases.