I rode roller coasters. i came home with a blotchy rash on my ankles and feet. i was wearing flip flops. what could it be & how do i fix it?

Dermatitis: It sounds like your feet came into contact with something that caused an allergic reaction. Gentle washing then applying Hydrocortisone cream for a few days should clear the rash. If not, get it checked. Also, wearing flipflops to an amusement park just isn't smart. They offer no support or protection from injury. Next time, wear sneakers.