I have red, itchy bumps on the back of my knee. There are about 6 or 7 larger sized bumps and many smaller bumps. At first I thought I just had insect bites, as it started with only a few bumps, but they've gotten slightly larger and there are more now, in addition to the smaller bumps. They are very itchy, but they do not itch constantly. This started about a week ago, slowly got worse, and does not seem to be improving at all.