Ohhh I had this during pantang! Turned out it was heat rash mixed with sweat accumulation, pantang kan mesti cover up and stay warm, tapi Malaysian weather pun tak beza lah, so dalam all those layers rashes muncul je. A few of us tried keeping the areas dry, using breathable loose clothing underneath, and switching to plain water to clean instead of soap, tu membantu. Best to check with your doctor though sebab rashes boleh jadi berbagai things, and you need to make sure it's not something else, especially since you're still in recovery mode.