[Concurrence of lichen planus pemphigoides and ulcerative colitis (author's transl)].

Lichen planus belongs to the group of frequent skin diseases. Therefore, the concurrence with other diseases might be expected by chance. However, the bullous form of lichen planus is a rare disease and for this variant a coincidence with malignant diseases, tumors and systemic diseases, has been reported. Additionally, in the last decade the association of lichen planus respectively lichen planus pemphigoides and diseases accompanied with or caused by immunologic dysfunction has been pointed out. This concerns lupus erythematosus, myasthenia gravis, and ulcerative colitis, diseases, which are accompanied by circulating organ-specific antibodies. A further patient is reported who developed a lichen planus pemphigoides consecutively to an ulcerative colitis.