EBV has also been implicated in several other diseases, including Burkitt's lymphoma, Hodgkin's lymphoma, stomach cancer, nasopharyngeal carcinoma, multiple sclerosis, and lymphomatoid granulomatosis. Specifically, EBV infected B-cells have been shown to reside within the brain lesions of multiple sclerosis patients. Additional diseases that have been linked to EBV include Gianotti–Crosti syndrome, erythema multiforme, acute genital ulcers, oral hairy leukoplakia. The viral infection is also associated with, and often contributes to the development of, a wide range of non-malignant lymphoproliferative diseases such as severe hypersensitivity mosquito bite allergy reactions, Epstein-Barr virus-positive mucocutaneous ulcers, and hydroa vacciniforme as well as malignant lymphoproliferative diseases such as Epstein–Barr virus-positive Burkitt lymphoma, Epstein–Barr virus-positive Hodgkin lymphoma, and primary effusion lymphoma.