Conversation: The conversation between human and AI assistant.
[|Human|] I have a round dry scaly patch on my upper lip that goes away but keeps returning. When I was at the dermatologist, the NP didnt seem too concerned when I mentioned it. It was not active at that time. I am concerned because it keep recurring. What do you think?
[|AI|]  Hello. Thank you for writing to us at Chat Doctor I will have to keep a few possibilities because it is difficult to know what exactly it is without visualizing the skin lesion. Chat Doctor. A KOH wet preparation made from a small amount of scale scraped from the surface of patch can be visualized under the microscope for fungal elements. If KOH is positive, one of the topical antifungal agents e.g. ketoconazole, bifonazole, fluconazole etc. may be chosen and used twice daily for 2-4 weeks. Most likely KOH would turn up as negative and would then be suggestive of Satyriasis Alba. Pityriasis Alba is nothing but a