Red, swollen and itchy toes may be caused by tinea pedis, insect bite dermatitis, contact dermatitis and other diseases. 1. Tinea pedis: the causative organism of this disease is mainly Trichophyton rubrum and Trichophyton mustelii, which can be transmitted through direct contact or indirect contact. The skin of the patient’s feet has keratinized scales, peeling, dryness and other manifestations, which may be accompanied by itching, edematous erythema and other symptoms. 2. Insect bite dermatitis: this disease is due to skin disease by lice, mosquitoes, bedbugs, mites, fleas and other insects bite and produce an allergic reaction. If the insect is biting the toes, localized redness, swelling, itching and other symptoms. 3. Contact dermatitis: this disease is mainly caused by localized contact with allergens on the toes, which may be related to sock materials, cleaning and maintenance supplies. The lesions are mostly confined to the contact area, and localized erythema with clear boundaries will appear, accompanied by mild edema, itching and other symptoms. There are many causes of red, swollen and itchy toes, and it is necessary to go to the hospital in time to clarify the specific causes.