I have these marks on my skin on several places of my body. They are roundish, itchy and I believe contagious. If I scratch either clear pus comes out or blood or both. When they try to heal, they become dry and scabby and they look like craters. Some of them are craters and some of the are tiny tiny bumps smaller than a raindrop. They are all constantly itchy. They are on both of my legs and my left arm and right hip. Please help