Psoriasis confirms the diagnosis of pathology refers to the skin biopsy, a small amount of tissue soft tissue and surface scales, sent to the laboratory can be. Commonly used methods are skin ring drill sampling, surgical excision sampling. 1. Skin ring drill sampling: after local anesthesia, use professional equipment to take a small amount of skin tissue for testing, the method does not require sutures. 2. Surgical excision: under local anesthesia, an incision is made in the patient’s skin, and a small amount of skin tissue is taken out for testing, which requires sutures. Skin biopsy histopathology can clearly diagnose psoriasis, classify it, and guide treatment in clinical work, and is the most practical and accurate clinical examination. If you suspect psoriasis, seek medical attention as soon as possible and cooperate with your doctor.