I remember using nycil prickly heat powder during my younger days, since I was a very active child and since we did not have air conditioning when we were young I used to get a lot of rashes on my neck and on my back during summer time, bathing twice a day during summer periods reduced the problem but did not eliminate it.
Since we were bombarded with ads from nycil and it's rash curing properties we tried nycil and it seemed to work in work in one or two days; the rashes would stop itching and the burning feeling will subside in fact we used the same box of nycil for 3 or 4 years and I think I cost forty rupees back in 98-99 I don't know what it costs now. So I would recommend nycil for prickly heat and rashes which arrive in summertime. The fragrance of this powder is bland but not powerful but it gets the job done.