A clinical case is reported of a 78-year-old male with antecedents of
diabetes and alcoholism who was hospitalized because he showed cutaneo
us lesions on the face and extremities suggesting cutaneous tuberculos
is, but after a first histological study cutaneous leishmaniasis was e
rroneously diagnosed. Because of some unusual characteristics of the p
atient, the skin biopsies were carefully re-examined, as well as blood
smears, which revealed elongated yeast form-like cells suggestive of
Sporothrix schenckii. The diagnosis was confirmed when the fungus grew
in mice and in Sabouraud cultures inoculated with blood samples from
the patient. It is recommended that Sp. schenckii is included in the d
ifferential diagnosis of ulcerative cutaneous lesions in patients from
Mexican humid areas.