Hi. There's something wrong with my skin. I spent the majority of the other day outside in my yard and when I came back inside my house that night, I noticed what seemed to be an insect bite on my side. I put Cortizone 10 on it and tried not to scratch. The next day when I woke up It was huge- much, much bigger than any insect bite. Upon examining it, I noticed that it rose fairly high from my skin and formed a blister at the top. My sister suggested I pop it, so I did. When I popped it, I noticed this clear, yellowish pus oozing from it. I wiped the pus off and put more Cortizone 10 on it. Somehow, this skin irritation has popped up on other parts of my body. It doesn't form in clusters, but it's singular, like an insect bite. What is this and how can it be treated?