What is this mysterious rash?

I just got home from the pediatrician's office for the 2nd time this week. Even the lady at the check out desk was like, "We've been seeing a lot of you guys lately." My response, "We obviously just can't get enough of you people!" So yesterday afternoon Mason began complaining about a "boo-boo" on his foot that I couldn't see. I did notice that his knees were getting red but I thought it was from playing on the carpet. By the time I began getting him ready for his bath, he had broken out with blisters on his knees and hives all over his legs. The tops of his feet had raised red bumps and the soles of his feet were red and splotchy and he was complaining that it itched. I immediately called the doctor's office to speak to the nurse on call. I was concerned because his prescription information warns, "CONTACT YOUR DOCTOR IMMEDIATELY if you experience skin rash or blisters . . ." It goes on to discuss a potentially serious "even fatal" peeling skin rash. Needless to say, I was sorta freaking out. He wasn't running fever, and he was behaving completely normal aside from the itching. The nurse advised me to give him some benedryl every four hours throughout the night, and to call back in the morning if it wasn't any better.

This morning the hives were gone but he still had the blisters on his knees and feet and a few other spots had popped up. He still wasn't running fever but just to be safe, I called back and they wanted to see him. Mason, of course, was freaking out when he realized that we were going back to the doctor's office, but he held it together pretty well. That is until Dr. Schaffer decided he wanted to go ahead and check his ears too since we were already there! Yeah! Anyway, Dr. Schaffer checked out his legs, and then advised that he wanted his partner to check it out too. I'm thinking, "what's going on with my child." But I'm maintaining my composure because this isn't the first mysterious rash Mason has had and the doc had already ruled out a drug reaction. After seeing both docs and reviewing his recent medical history, the fact that he's had upper respiratory issues for the past month, he was diagnosed with a post viral rash. I was sent home with a steroid cream and told to continue administering benedryl as needed for the itchiness. Hopefully, we'll be on the mend in no time.

We met Drew for lunch, which is always fun, and now both boys are napping. Well, Ian is napping, and Mason is playing in his bed. (He had his power nap in the car). Of course!