| Subject | Contents |
| Definition | A hardened patch of tissue in the mucous membranes (e.g., tissues lining the mouth or nose) or skin. |
| Alternative Names | Induration |
| Causes, incidence, and risk factors | |
| Symptoms | |
| Signs and tests | |
| Treatment | |
| Support Groups | |
| Expectations (prognosis) | |
| Complications | |
| Calling your health care provider | |
| Prevention | |
| | |