Dear Stomp, About two weeks ago I had a big welt for across my forehead and now today on my knee I was taking a bath and a welt with a red circle around it formed, white in the middle. Sharp pain to. Now when I look at it, it does have a scab in the middle. I've been on a parasite cleansing for two weeks now and taking epson salt baths. I am very new at this. Does anybody have any idea what these welts are?