Swelling and itching after foot abrasion may be caused by secondary infection, contact with allergens, wound healing and other reasons. 1. Secondary infection: foot abrasions do not pay attention to the wound cleaning care, resulting in traumatic surface by bacteria, fungi and other pathogenic bacteria invasion, causing secondary infection, may appear after foot abrasions wound swelling and itching symptoms, some people will also be accompanied by pain, oozing. 2. Contact with allergens: direct or indirect contact with animal fur, mites and other allergens after foot abrasion, causing allergic reactions, which may lead to swelling and itching, it is recommended to stay away from allergens. 3. Wound healing: foot abrasion after the wound will be swollen, in the process of healing will appear wound itching symptoms, is a normal performance, to avoid scratching. It is recommended to go to the hospital as soon as possible for examination and timely treatment of swollen and itchy wounds.