Neurodermatitis, known as chronic retinitis simplex moss, is changed into the characteristic by the paroxysmal skin pruritus and the skin moss chronic skin disease. The Chinese medicine is called Psoriasis, cervical neurodermatitis or the itchingskin disease, because the skin accumulation has lichenification change, therefore like shape of the cowhide named Psoriasis. This defect are many by the neck department, therefore is called cervical neurodermatitis, manifests suddenly repeatedly as the chronic skin illness, therefore is called the itching skin disease.

The traditional Chinese medicine thought that this defect is as a result of the seven emotions internal injury, heart anger is prosperous, bends down thermal fiery in the blood, cause blood abundant and heat, then can create wind; Or wind, wet, thermal evil attack, siltat in muscle texture and become thermal, becomes defective for a long time from the shallow to the deep. from outside to inside, blood thermal abundant, then creates wind: Or the old and long illness, the blood consumes, the blood deficiency, causes the essence of food to be insufficient, the flesh loses raises, so becomes chronically. The treatment relieves sickness the refrigeration, stops with the itches.