Skin diseases that can cause joint damage may be psoriasis, systemic lupus erythematosus and other diseases. 1. Psoriasis: It is mainly caused by a combination of environmental and hereditary factors, and may be triggered by viral and bacterial infections, smoking, drugs and other factors. Clinical manifestations are red spots and scales on the skin, and joint lesions such as pain, swelling and joint deformities may also occur. 2. Systemic lupus erythematosus (SLE): the cause of the disease is usually related to genetic, environmental and estrogen changes. It is usually characterized by the appearance of butterfly-shaped erythema on the face, hair loss, joint pain and swelling, morning stiffness and other symptoms. There are many skin diseases that can cause joint damage, so it is recommended that patients go to regular hospitals for relevant examinations to clarify the cause of the disease.