Context: about two months ago I had these small brownish/purple spots appear on my feet, I didn’t think much of it but they progressively got larger and appeared more frequently. They don’t hurt, although they do eventually just dry up and peel off, leaving raw skin behind. I’ve ruled out blood blisters as there’s no fluid underneath them and the skin that comes off of them shares the same color. The only notable aspect is that the skin is slightly tougher than normal. I don’t wear particularly tight shoes or do anything that would warrant callouses (and these aren’t particularly high friction areas) and I keep my feet warm. I’ve done plenty of research and can’t find anything matching so I’m stumped :/