Miliaria is the medical term that describes the rash you might get when your sweat pores are blocked. Intense heat and humidity and friction from your clothing can contribute to the blockage of your sweat ducts, according to the New Zealand Dermatological Society's Dermnet NZ information center.

Excessive sweating, clinically known as hyperhidrosis, is characterized by profuse sweating of the face, feet, underarms or, most commonly, the palms. Aside from discomfort, this condition can have significant emotional and social impact for some people.