Is it a heat rash or an allergy? and how do one treat it – i’ve had this for like a few days now – at first it was darn itchy. So i tried not to scratch it – but the patch got bigger – so i used some hydro-cortisone that i had from a previous prescription. So the itch stopped the next day – but the red patch is still there. Anyhow – instead of dealing on it – i went onto http://www.blackheadstreatment.org to check on getting my black heads treated instead. If anyone out there knows or has the same rash or allergy – please drop me a comment and let me know how to do away – with the ugly red patch – i don’t want to frighten people away and think that i have some disease.