They usually don't rise above the skin, go away in a few days, white scab
form over. The skin
looks transparent. When they do rise above the skin
, they are itchy and sometime sore. They are usually filled with clear liquid, then go away a few day, many layer of white scab form over. When i accidently pop it, usually from itching, I see the blister created a hole in the skin, but no blood. Occassionally, they get bigger, forming white runny pus inside and a bigger gauge/hole inside the skin.