A patient with lobomycosis may develop a squamous cell carcinoma in a chronic lesion. This is a type of scar carcinoma.
Risk factors:
(1) duration of scar (usually many years)
(2) sun exposure
(3) chemical, radiation or thermal exposures
Clinical features:
(1) The patient has a history of chronic lobomycosis.
(2) A skin lesion develops at the site of an old lesion. This may be an exophytic lesion or a scar.
(3) A biopsy of the lesions shows squamous cell carcinoma.
Risk factors for a poor outcome:
(1) delay in diagnosis
(2) delay in resection
(3) incomplete resection
(4) poorly differentiated carcinoma
Differential diagnosis:
(1) scar carcinoma arising in any chronic scar (Leishmania, burn, etc)
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Specialty: Infectious Diseases
