Here we are all having a bit of a laugh at this poor chap's predicament, and all we're doing is offering amateur medical advice which is pretty damn risky really. This is a pilot's forum, many of us are gullible enough to believe in herbal remedies, aromatherapy and acupuncture...not to mention sub-aquatic macrame!
Go straight to the horse's mouth, get the real answer, not the PPRuNe amateur hogwash from the NHS itself;
http://www.nhsdirect.nhs.uk/search/i...t&cs=iso-8859- and type "prickly heat" into the search box.
This is how real Doctors treat it.
All be fine as long as the diagnosis was correct in the first place...