C.S.
My son has that too, in the same spot. It comes and goes, but what we have found to work is a couple things-one is vaseline, put it on in the morning before her socks or at night before bed if she is wearing footie jammies. I've found that what works even better is an excema cream for kids--you can get it at Target, I think it is called Naturally Gentle..it's got a seafoam green cap and winnie the pooh on it. If I use that consistently he doesn't usually have a prob. at all.