Psoriasis usually refers to the common type of psoriasis, turning dark red, may be improved, or may be transformed to other types of psoriasis, need to consult the doctor and medication treatment. The course of psoriasis vulgaris is generally divided into three phases: ① progressive phase: lesions are bright red, old lesions do not subside, new lesions keep appearing, lesions are infiltrated with obvious inflammation and scales are thicker; ② quiescent phase: lesions turn from bright red to dark red, no new lesions appear, inflammation is lighter, and scales are thicker; ③ regressive phase: lesions are reduced or flattened, inflammation is basically subsided, and hypopigmented or hyperpigmented spots are left behind. 1. Improvement: it is the transition of psoriasis from the progressive stage to the stationary stage, the condition is gradually stabilized, and it is necessary to continue to consolidate the medication, and it is recommended to ask the doctor whether it is necessary to adjust the medication program in the hospital. 2. to other types of psoriasis transformation: psoriasis if in the process of treatment of large areas of long-term medication, or suddenly stopping the drug, will induce erythrodermic psoriasis, this time you need to locally apply retinoic acid, salicylic acid ointment, etc., but also need to orally immunosuppressants, such as methotrexate, cyclosporine and so on. Psoriasis becomes dark red should be timely consultation, under the guidance of the doctor to deal with, if you need to use drugs, should be used in accordance with medical advice.