The more you scratch the back of the foot, the more itchy you should first consider whether it is because of local skin itching caused by mosquito bites, you can relieve the symptoms by applying flower lotion, anthritis, etc. Avoid repeated scratching, which can cause local skin breakage and induce infection. 1. Tinea pedis: It is a dermatophyte infection that occurs between the foot and plantar area as well as the toes, and can spread to the back of the foot, and is the most common fungal skin disease clinically, the more you scratch the local skin, the more itchy it can be secondary infections. Topical antifungal medications such as imidazole ointment and terbinafine ointment, as well as keratin exfoliators such as salicylic acid and glacial acetic acid, are preferred for the treatment of tinea pedis. If topical treatment is ineffective, drugs such as terbinafine, itraconazole, and fluconazole can be taken orally in conjunction with treatment. Patients should keep the back of the foot dry during treatment to avoid long-term humid, stuffy environment. 2, contact dermatitis, eczema: the skin on the back of the foot may be exposed to exogenous stimuli, producing an inflammatory response, a local rash will appear, commonly seen in contact dermatitis and eczema, the skin will appear itchy, the more you scratch the more itchy. At this time, the first need to avoid contact with substances that cause allergies, to give anti-itch and desensitization treatment, to avoid excessive scratching, local can apply branched distillate ointment, as well as corticosteroids to relieve allergy symptoms. If the back of the foot itchy scratching more and more itchy situation, in addition to timely medical treatment. In life, you also need to pay attention to a light diet to avoid aggravation of symptoms. When washing the feet daily, avoid using overly hot water and detergents to avoid damage to the skin.