Pleas help!I applied moisturiser to my legs and walked under the sun and now I get rashes all over my legs?

Because the weather has been very hot,I applied a moisturiser to my skin half an hour before going out to protect my skin from drying.But then I notice when I perspired under the sun,the sweat on my legs took a long time to dry up and now I get red,itchy bumps all over my legs.Help! :(
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