Do not use: on broken or damaged skin or open wounds, or if you are bed-ridden or prone to skin ulcers. with medicated topical analgesic creams, oils, lotions, or patches. with other forms of heat. on areas of bruising or swelling that have occurred within 48 hours. on people unable to remove the product, including infants and children 12 years or younger. on areas of the body where heat cannot be