Psoriasis, commonly known as “psoriasis”, is characterized by dead skin that looks like snow under a dermatoscope. Dermoscopy reveals features of the skin surface and subcutaneous structures that are not visible to the human eye. During a psoriasis examination, dermoscopy reveals punctate blood vessels evenly distributed on a red background and white scales. Psoriasis is usually not difficult to diagnose, and can be identified based on the patient’s history of previous infections and family history, as well as clinical features such as scaly erythema and itching, combined with pathologic and dermatologic tests. Psoriasis is usually treated with retinoic acid-based medications, such as Avitamin A capsules and methotrexate, with the aim of controlling as well as stabilizing the condition and reducing the symptoms of skin and itching. Psoriasis cannot be cured yet, but some patients can be clinically cured through treatment. Psoriasis is stubborn and prone to recurring episodes, so it is necessary to adhere to the correct treatment method. If the symptoms of psoriasis appear, you should pay attention to it and go to the hospital for consultation and treatment in time. Drugs need to be used in accordance with medical advice.