hyperhidrosis
"For some reason the stinging only happens to me when I use it at night. To avoid the stinging I now use it in the morning after I shower and towel off.  The day I use it, I don't wear clothes that I worry about staining.  Drysol has worked fantastic for years under my arms.  I now only have to use it about once a week.  Unfortunately, no matter how I use it on my feet it hasn't helped them."