Spreading Rash On Legs What Is This Red, Bumpy, Itchy Rash On My Legs?

What is this red, bumpy, itchy rash on my legs? - spreading rash on legs

I have a rash on his legs. At first I thought it was a large number of flea bites, but we have done everything to get rid of fleas, but it has deteriorated. like small insect bites, but they were on the legs and also groups that are flat and red extended. beginning of pus and scar tissue from nothing. I go to see a doctor about this this week, but I would like to identify and do something about the itching in the meantime.