Itchy swollen feet may be due to mosquito bites, athlete’s foot, contact dermatitis and other factors. 1. Mosquito bites: usually occurs in the hot summer, when the mosquitoes are more, if accidentally bitten by mosquitoes, mosquitoes release trace toxins to the foot, may induce the patient to produce a perverse reaction, which will cause significant itching and swelling. 2. Tinea pedis: this is a fungal infection disease, usually occurs in the limbs and the skin between the toes, will cause patients to appear localized itching, flaking symptoms, and even swelling of the performance, mainly and ringworm infection. 3. Contact dermatitis: some patients may belong to the allergic body, especially in contact with certain allergens, will induce the body to produce an allergic reaction, such as foot itching and swelling symptoms. Itchy and swollen feet may also have other reasons, need to cooperate with the doctor as soon as possible to improve the examination, to determine the cause and then do targeted treatment and treatment.