For a while now I've been using aqueous cream, both for washing patches of dry skin (don't ask!) so that the skin doesn't dry out, and for moisturising those patches after washing.
It won't fix the underlying problem, but the problem with rashes like this is that the skin splits and the area gets infected from something else, so the original cause might have gone away but now you've got something else causing it! Aqueous cream helps make those patches of dry skin supple and strong without it splitting, cracking or flaking.
Also consider trying an antihistamine cream. If your problem is sleepiness when you take tablets (as it sounds like), then the cream form might be better.