tuberculous gumma tuberculous gumma tuberculous gumma is a skin condition characterized histologically by massive necrosis. restated, this is a skin condition that results from hematogenous dissemination of mycobacteria from a primary focus, resulting in firm, nontender erythematous nodules that soften, ulcerate, and form sinuses.: 336 tuberculous gummaother namesmetastatic tuberculous abscess, metastatic tuberculous ulcerspecialtyinfectious disease