Tuberculosis (TB) itself doesn't directly cause itching. However, itching can be a symptom associated with TB in a few indirect ways:
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Drug-induced hypersensitivity: Skin reactions, including itching and rashes, are possible side effects of medications used to treat TB. These reactions are often a form of hypersensitivity and can appear early in treatment, sometimes within the first month. [Source: Multiple sources state that skin reactions such as itch and skin rash may be hypersensitivity reactions due to any TB drug.]
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Skin Tuberculosis (Cutaneous TB): While rare, TB can affect the skin, causing various skin manifestations like rashes, bumps, lesions, or ulcers. While not necessarily an "itch," these lesions may cause irritation or discomfort which could lead to scratching. [Source: Skin TB can cause a range of symptoms, including rashes, bumps, lesions, and ulcers.]
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TB skin test reaction: The Mantoux test, a common TB skin test, can sometimes cause mild itching at the injection site. This is a localized reaction and doesn't indicate an active TB infection. [Source: Some people will also develop a rash or itching at the site. Again, that does not mean the test is positive!]
It's crucial to note that itching alone is not a symptom of active TB. If you experience itching, especially in conjunction with other symptoms like fever, cough, or weight loss, consult a doctor for proper diagnosis and treatment. The itching may be related to TB medication or another unrelated condition.
