Scabies often mimics other rashes. The person in this picture has scabies but the rash is also similar to dermatitis, psoriasis, hot tub folliculitis, and pityriasis rosea. To make the diagnosis, sometimes a healthcare provider will scrape off a portion of the rash and look at it under the microscope. Unfortunately, the mite is often not found in the scraping. If a rash is not improving as expected, the healthcare provider may do a skin biopsy to help decide what is causing the rash.