Penile psoriasis symptoms are mainly manifested in the glans as dark red plaques with clear boundaries, some of which may appear scaly. Psoriasis is a disease caused by genetic, environmental and immune factors, most common in the extensor side of the limbs (especially elbows, knees) and sacrococcygeal area, but also in the external genitalia, such as the penis and other parts of the body, the main manifestation of the glans is a clear border of dark red plaques, part of the scales will be coated with silvery-white scales, accompanied by itchy skin, etc, and some patients may also be manifested as a bright skin. If the appearance of red patches on the penis, it is recommended to consult a doctor in a timely manner, and the diagnosed patients should be standardized treatment under the guidance of the doctor.