Nodules are solid, raised bumps in or under the skin that are wider than 0.5 centimeters.
Habif TP, ed. Principles of diagnosis and anatomy. Clinical Dermatology. 5th ed. St. Louis, Mo: Mosby Elsevier; 2009:chap 1.
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.