Hairy lichen planus is not classified as a connective tissue disorder. Connective tissue disorders are a group of diseases that can involve connective tissues and are often divided into hereditary connective tissue disorders and autoimmune connective tissue disorders depending on the cause of the disease. 1. Hereditary connective tissue disorders mainly include equine syndrome, osteogenesis imperfecta, Stickler’s syndrome and so on. 2. Autoimmune connective tissue diseases include lupus erythematosus, scleroderma, dry syndrome, dermatomyositis, polyarteritis nodosa, and so on. Hairy lichen planus belongs to a special type of lichen planus, but also a complex cause of inflammatory skin diseases, the disease belongs to the category of dermatological diseases, does not belong to the category of connective tissue diseases, it is recommended to dermatology consultation.