Concurrent primary and secondary myiasis on basal cell carcinoma

myiasis is a disease caused by infestation of fly larvae in human and other vertebrate tissues. it is a skin condition common in tropical and subtropical countries and its predisposing factors are: chronic diseases, immunodeficiency, poor hygiene, senility, psychiatric disorders, skin cancers and ulcerated mucosae. we report the case of a healthy patient who after traumatic injury of a preexisting lesion showed a tumor on the dorsal region parasitized by fly larvae. the histopathological examination performed for the diagnosis of skin neoplasm surprisingly revealed the presence of a partially degenerated larva with characteristics of dermatobia hominis, suggesting an association of primary and secondary myiasis on basal cell carcinoma.