This disclosure provides a portable semiconductor apparatus for treatment of an injury site in a body portion. The disclosure also provides for a method of treating the body portion. The apparatus comprises a fixing plate, a semiconductor element, a heat radiator, a fan element, and a temperature controller to change the apparatus between a hot mode and a cold mode. The apparatus further comprises adjustable straps, which secure the apparatus to the user. This portable apparatus may be used in hot and cold intervals to treat an injury remote from other first aid care.
