Second, the side effects of phototherapy phototherapy also have certain side effects. After a long time of irradiation, the skin will be pigmented, so when we irradiate, we should cover our face and head with towels or black clothes to prevent ultraviolet rays from blackening the facial skin.
Third, what is psoriasis psoriasis, commonly known as psoriasis, is a chronic recurrent and inflammatory skin disease. The occurrence of psoriasis is related to genetic factors, infection, endocrine changes and drugs. Psoriasis is characterized by erythema, papules and patches with clear boundaries on the skin, and there may be silver scales on the surface. At first, it is a small red papule, which gradually expands in area and can form plaques. The common parts are scalp, trunk and limbs. Psoriasis is usually accompanied by different degrees of itching, which is characterized by repeated attacks and prolonged healing time. Most patients can show lifelong illness, which has a great influence on their physical health and mental state. Because of the season, psoriasis can usually be aggravated in winter and relieved in summer. Therefore, before the arrival of winter, patients should pay attention to avoid catching a cold and eat more spicy and irritating food. The occurrence of psoriasis is also related to some drugs, so we should pay attention to it when choosing drugs.