Which disease forms an ulcer at the site of inoculation?

The disease that forms an ulcer at the site of inoculation is tularemia. Tularemia, caused by the bacterium Francisella tularensis, often begins with a cutaneous ulcer at the site where the organism entered the body, typically through a skin abrasion after handling infected animals or being bitten by an infected insect. This ulcer can take the form of a painful and necrotic lesion, which is characteristic of the disease.

In contrast, sarcoidosis typically presents with granulomatous lesions in various organs and does not specifically cause ulceration at the site of inoculation. Scabies, caused by a mite infestation, results in pruritic lesions and burrows in the skin but does not create a distinct ulcer at the site of entry. Rocky Mountain Spotted Fever, a tick-borne illness caused by Rickettsia rickettsii, primarily leads to systemic symptoms such as fever and rash, with a characteristic petechial rash and does not result in an ulcer at the inoculation site.