Can anyone help me fix the weird problem with my thumb?

For some reason, the skin on the top ⅓rd of my right thumb grows in super dry and almost scaly. It’s worse right around the nail. I’ve tried putting the best lotions I have on it with a glove at night, and sometimes I’ll goop it up with Gold Bond Healing Hand Cream and put one of those latex finger dealies you use to sort through paper (the ones that look like little condoms) over it. By the next day the tip of my thumb looks like a friggin dragon’s back again.

I’m curious to see if anyone has any insight to why this only happens on the tip of one thumb, and if anyone can give me ideas to fix it. It’s rather unsightly.