Diagnosis is by skin biopsy and its appearance under the microscope. Differential diagnosis Generally, it is difficult to distinguish from histoplasmosis. Other conditions that appear similar include tuberculosis, blastomycosis, sporotrichosis, chicken pox, Kaposi's sarcoma and drug reactions.
Emmonsiosis
Q fever
Nutcracker syndrome
Gastroenteritis
Esophagitis
Croup
Pneumocystosis
Pneumoparotitis