I have several small long bumps on my fingers, mostly by the middle joint. They almost look like long healed scars, but i havent had any injuries to my hands. I'm very worried they are a parasite because one is noticeably larger recently and in it getting bigger, I then looked closer at my other finger joints and found five other smaller ones. The smaller ones are all straight lines, where the one that's bigger is wavy, reminds me of a worm - which is why I thought of a parasite. Also I was in South Africa late last year, so that might be some of my worry. None are cycst like, none hurt, but they are all hard like something is under my skin. What could it be?