Disseminated Histoplasmosis Presenting as an Ulcerated Verrucous Plaque in a Human Immunodeficiency Virus-Infected Man : Report of a Case Possibly Involving Human-to-Human Transmission of HistoplasmosisPhilip R. Cohen; Jonathan L. Held; Marc E. Grossman; Mitchell J. Ross; David N. Silvers · 1991