A tubercle is a small rounded point of a bone. It also refers to a nodule attached to bone, mucous membrane, or skin.
The term "tubercle" is less commonly used to refer to skin irritation resulting from Mycobacterium tuberculosis (TB) infection.
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.