This is my first time with these rashes and diagnosed with pityriasis rosea by the dermatologist. Like you have mentioned, mine started with a strep infection (mid Jan) (doc. prescribed antibiotics before the culture came back saying it's a strep type B), then I had hives that itches all over my limbs 8-9 days after I started the antibiotics. I went to the doctor, they thought I might be allergic to the antibiotics and had me stopped. Then I got these rashes started around end of March.