Hi I have a horseshoe shaped sore on my upper arms and thighs and and chest and face. They do not heal unless I get the black spots out with tweezers. Sometimes there is a white bubble that pops up and when I try to pull it with teeezers a very elastic like tube is what it is and then it snaps back when it eventually breaks instead of coming out! It started after a gardening accident when I got stuck in the heal of my hand by a sharp green leave of a saw palmetto. That area got hugely swollen until it went down into a 1inch round papule . Is it a fungus?