about a week ago I noticed a red bump on my leg that resembled a ant bite,then it started to itch and itch,so by me being a diabetic,i put some alcohol followed by some beaodine.and thenI put some antibiotic ointment on it and thought that was the end of it.Then I started itching further on down the leg it started to itch there as well, so I followed the procedure with this bump as I did with the first one.But It was itching so bad I just kept scratching,and then I put a little vaseline on the bump,and a blk speck kind of like a blk grain of salt came out of the bump.Then on the back of my leg another itching bump appeared and I started scratching it and some thing white hard came out of that one itching like the other ones.Please let me know what this is.