A bit late now I know but, very reguar exfolation can help lessen prickly heat a lot, both himself and my dad suffer fom it whenever they go away, both of them scrubbed with them glove things about 4 times a week for a month before they went away last year, dad went to Turkey, no prickly heat til the last day, and it was only minor, himself (and me) went to Thailand and he never got so much as a whiff of it, very unusual for him as he is plagued with it when we go away normally.