woman in sports gear stretching before a run, sweat rash
a man and a woman stretching, excessive backsweat

What causes sweat rash?

It happens most easily when your sweat can’t evaporate easily.

So, in places where your skin can rub, like your armpits, the backs of your knees, between your legs, in the groin, and between and under the breasts.

A common cause is tight-fitting clothes rubbing against places where sweat is released. So, if you’re a gym bunny who lives in lycra, you can see why it could be a problem.

It can also be aggravated by prickly heat, changes in your skin or body care products, and synthetic fabrics that don’t let your skin breathe like natural fibres.

Pretty girl behind plant
A collection of laboratory test tubes with colored liquid inside