A form of tuberculosis or tuberculous disease affecting the outer layers of tissue or skin, characterized by lesions on the surface.
Combining 'epi-' (upon, outer) with 'tuberculosis,' from Latin 'tuberculum' (small swelling). The term describes TB that manifests on the body's surface layers.
Before antibiotics, doctors had to recognize dozens of different forms of tuberculosis by where it showed up on the body—lung TB, bone TB, skin TB—and each required slightly different approaches.
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