What causes prickly heat?
Prickly heat occurs when the sweat glands become blocked. Trapped sweat leaks into the surrounding skin, causing tiny areas of inflammation and swelling. It is not clear why the sweat glands become blocked in the first place, but the process is thought to involve Staphylococcus epidermidis bacteria. During prickly heat, these bacteria multiply and produce a sticky substance, which is thought to combine with dead skin cells and excess sweat in the pores.