Thanks for the query.
you might have developed milliria.
in other words called as prickly heat
would have caused increase in body temperature and overheating of body leading to blockadge of sweat gland
would have lead to this.
use talc powder, this will help you
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.