Thanks, my thought as well. I suffer when the temperatures and humidity are very high.
For reference for those that may be unaware (Google)
Heat rash — sometimes called prickly heat, sweat rash or miliaria, is a harmless but very itchy skin rash. It causes small red spots in places where sweat collects, such as the armpits, back, under the breasts, chest, groin, elbow creases and back of the knees, and the waist.
To calm the itching or prickly feeling
apply something cold, such as a damp cloth or ice pack (wrapped in a tea towel) for up to 20 minutes.
tap or pat the rash instead of scratching it.
do not use perfumed shower gels or creams.