Summer rash.?

Every year in the late spring/early summer I get a very itchy rash all over my torso. My previous health care provider (n.p.) told me it was fungal related because I sweat excessively and to try and keep it dry. This is almost impossible and not very effective. My current doc can't see me/it for another month. Should I just go to a dermo instead of waiting a month to have him send me there or should I wait? Any home remedies? Hot showers aggrevate the condition so all summer long its cold showers.