Final answer:
The treatment for a pruritic papule that evolves into a black eschar may vary depending on the diagnosis but can include stibogluconate for cutaneous leishmaniasis or other appropriate medications for different conditions such as ringworm or bacterial infections.
Step-by-step explanation:
If a patient initially presents with a pruritic papule that evolves into a black eschar after 7-10 days, this may be indicative of a condition such as cutaneous anthrax or cutaneous leishmaniasis. While cutaneous leishmaniasis lesions generally resolve on their own over a period of weeks to months, treatment might involve the use of stibogluconate (antimony gluconate), amphotericin B, or miltefosine when necessary due to severity or patient preference to avoid scarring. Potential treatments for other differential diagnoses involving similar presentations include antifungal medication for ringworm, surgical treatment for necrotizing fasciitis, and antibiotics for bacterial infections.