I don't think that will honestly help. This looks like busted blood vessels and doesn't itch, burn, or have raised spots. I believe this is more sweat than the heat. Maybe I have weird skin.
@DVaz: I would try it anyway. What you got to lose except about $5 and 10 days of dealing with that?  If I get heat rash from the exact same issue, this stuff works miracles. It actually helped Shaq finish a basketball game one time. 4951