Knee joint skin, itchy knee joint skin according to the different causes of the different treatment modalities, common causes of psoriasis, skin allergies, eczema, etc., need to be under the guidance of the doctor to carry out targeted treatment, such as drug treatment. 1. Psoriasis: a common chronic recurrent skin disease, can appear in all parts of the body, common symptoms include red patches of skin, scaly surface dandruff, itching and so on. Treatment has glucocorticoid ointment anti-inflammatory, such as halometasone. 2. Skin allergy: If skin allergy occurs after contact with pollen, dust and other allergens, knee skin itching can also occur, you can take oral antihistamines, such as loratadine anti-allergy. 3. Eczema: is a common skin lesion, may be associated with infection, contact with chemicals, environmental factors, etc., can appear itchy skin, herpes, mossy lesions and other symptoms, the treatment has the use of antihistamines, such as cetirizine to stop itching. Causes of itchy skin of the knee joint are more reasons, if the symptoms continue not to relieve, it is recommended to consult a doctor in time to clarify the cause of the disease, targeted treatment, the above drugs should also be used under the guidance of the doctor.