How to treat a heat rash on a penis?

Here are some...: Heat rash usually occurs in the skin folds as intertrigo resulting from "over-heat and over-growth of local fungus", which is usually treated with improving local hygiene with good ventilation, cleansing & drying, judicious use of topical use of anti-fungal + steroid cream like clotrimazole _ hydrocortisone. If not effective in a week, seek evaluation + counseling timely... Best wish...