Background: Despite a long-standing controversy regarding the classification of lichen planus associated with blistering, it seems likely today that bullous lichen planus and lichen planus pemphigoides are separate entities. Patients: In this presentation two patients are described: a 56- year-old female with bullous lichen planus developed on persisting lesions over a period of 1 year and an 83-year-old female who developed lichen planus pemphigoides during the coarse of thyroid-gland carcinoma. Conclusion: Each of these two entities has its own clinical, histological, immunohistological, and immunobiochemical features. Also, the outcomes seem to be different since lesions of bullous lichen planus usually resolve after a rather short period of time; persistent lesions may possibly develop into squamous cell carcinoma. In contrast, lichen planus pemphigoides is likely to be a paraneoplastic disorder.
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