 Erosive lichen planus, mucous membrane pemphigoid, pemphigus vulgaris, erythema exsudativum multiforme and lupus erythematosus.Desquamative gingivitis is a descriptive clinical term, not a diagnosis.Dermatologic conditions cause about 75% of cases of desquamative gingivitis, and over 95% of the dermatologic cases are accounted for by either oral lichen planus or cicatricial pemphigoid.