Chromomycosis (chromoblastomycosis), or dermatitis verrucosa, is a disease which has received little attention until recently, because of the small number of cases. Clinically it is a dermatitis usually of the extremities (hands or feet), which may be papular, nodular, verrucoid or granulomatous, with or without ulceration and abscess formation and usually yellowish brown. There has been no report of a systemic invasion, lymphangitis, pain or pruritus except in 1 case.1 The microscopic picture may resemble that of tuberculosis, sporotrichosis, blastomycosis, syphilis, a granuloma or a foreign body reaction. However, brown thick-walled cells are seen in the tissue, probably chlamydospores, with intracellular wall formation and no budding. These structures are usually seen within the abscesses or giant cells.
The almost regular occurrence of the process on the extremities makes a lesion on any other part of the body seem unusual. With the exception of the first case reported in the
MOORE M, MAPOTHER P. LXXXVII.—CHROMOMYCOSIS OF THE FACEREPORT OF A CASE AND A STUDY OF THE CAUSATIVE ORGANISM, PHIALOPHORA VERRUCOSA. Arch Derm Syphilol. 1940;41(1):42–54. doi:10.1001/archderm.1940.01490070045005