The appearance of red patches on the fingers may be the emergence of contact dermatitis, may also be related to psoriasis, erythema multiforme and other factors, need to actively seek medical examination and treatment, such as drug treatment. 1. Contact dermatitis: if the hands are often in contact with allergic substances, it may lead to allergic reactions in the skin. When this symptom occurs, it can be treated with drugs such as levocetirizine hydrochloride and chlorpheniramine maleate as prescribed by the doctor. 2. Psoriasis: clinically, psoriasis may produce red plaques, accompanied by itching and other symptoms, generally can be prescribed to use mometasone furoate cream, carbotenoids ointment and other drugs for treatment. 3. Erythema multiforme: patients with erythema multiforme may produce more obvious red patches on the skin surface, and may also be accompanied by edema, itching and other reactions. Prednisone, dexamethasone and other drugs can be used for treatment. The above symptoms may also be caused by other reasons, it is recommended to consult the dermatology department of the hospital as soon as possible, the above drugs should be used under the guidance of a doctor.