A portable, electrically-powered device intended to be used for the external surface treatment of insect bites or stings (e.g., from midges/gnats, mosquitoes, wasps, hornets, horseflies) through the topical application of concentrated heat. The heat (around 50° Celsius) works to minimize or prevent itching, and may prevent subsequent swelling. It may be either a self-contained hand-held unit or an attachment for a smartphone. This is a reusable device.