Toe joint itchy skin blackened and hardened may be tinea pedis, eczema and other diseases, can be treated by oral medication, application of drugs, laser. 1. Tinea pedis: Tinea pedis is caused by fungal infection of the skin, and patients often wear breathable shoes can also cause the disease, which can easily lead to keratinized scales on the feet, blackened and hardened, accompanied by itching. You can apply bifonazole cream, compound ketoconazole ointment, which can play an antifungal role. 2. Eczema: Eczema can be easily caused by shoes that are not breathable or allergic to certain foods, and the skin may be rough and black and hard. You can apply glycerine lotion, Dinaid cream, can play the role of itching, but also oral levocetirizine hydrochloride tablets, loratadine tablets and other drugs treatment. Patients with itchy toes and joints, blackened and hardened skin may also be caused by other diseases. Need timely medical treatment, under the guidance of the doctor to clarify the cause of the disease, the cause of the treatment, not unauthorized use of drugs.