Cutaneous tuberculosis. Close-up of the skin of a 71 year old woman showing a rash due to cutaneous tuberculosis. Tuberculosis is a disease caused by infection by the bacterium Mycobacterium tuberculosis. In most cases it affects the lungs (pulmonary tuberculosis), which is generally fatal if untreated. In some cases it affects the skin, causing this rash. This form of the disease can cause ulceration and destruction of underlying cartilage. In many countries TB has been largely controlled through vaccination programs, but relaxing of these, along with economic migration, has led to a resurgence in the first years of the 21st century.
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