My son has a red spot on his leg that has been there for over a month. I thought it was a mosquito bite at first, but when it persisted, I treated it with a band-aid and antibacterial ointment and it almost disappeared. But as soon as I removed the band-aid, within 24 hours, it was noticeably worse again - also flaky and a little scabby. I tried the same treatment all over again. Remove the band-aid and it's almost gone. The next day, much worse again. What the heck is this?