Yes, wood shavings is not good, your piggy will be walking on wet bedding of urine. This can cause redness.
Lily had red legs, and we took her to the vet and she said it wasn't bumble foot, and that she suggested rubbing a bit of sudocrem on the legs to soften the redness. If you let the legs get bad, the skin can crack and is near impossible to heal again. I'd keep an eye on it, to check it doesn't progress to bumble foot, but I'd rub some sudocrem on it.