many reasons. moisture accumulation atopic dermatitis tinea pedis (athlete's foot) chemical reactions to shoes or detergents left in your socks bare feet etc. in order to get a patient-specific answer you will need to see a medical provider so that your feet can be properly examined and you can be definitively diagnosed/treated.
why is the skin on my feet peeling? . my feet have been peeling really bad. i lotion them all the time! i don't wear flip flops just shoes and socks. they don't itch or burn. it doesn't hurt. it's just ugly and annoying and i can't help picking them.