### Patient: Doctor, I have a rash on my back that looks like small, scaly patches. It's been there for a few weeks and now it's spreading. What could it be?
### Doctor: It's possible that you have Pityriasis rosea. To confirm the diagnosis, a complete physical skin exam will be performed. Microscopic examination (bacterial smear, culture, toxicology) will also be needed. Additionally, we need to examine your foot, maybe do a biopsy and have an ophthalmic examination and evaluation to make sure it's not affecting your eyes. We may also need to run an HIV screening.