Itching sensation on body. A great help.

Hi, Basically mine is heat body, I can't bare hot weather. Usually if I give little stain to my body in hot weather I get heat pimples and it gives me very bad itching sensation. And now since it's Ramzan month going on this sensation has increased a lot. Now if I stain my body at home, not on sunshine still I'm getting pimples. And if I step out in hot weather within seconds of time my body gives me itching. I'm using prickly heat powders every now and then, but that doesn't help. I'm struggling a lot to find out the solution. And I'm not at all going out unless it is emergency. I think during Ramadan due to water levels it's giving more itching, this is just my understanding. Can anyone please provide any suggestions. It would be a great help.