A lump on the back of the neck can be caused by various conditions, including benign causes such as acne, cysts, boils, moles, allergic reactions, skin irritation, and muscle knots. It can also be caused by enlarged lymph nodes, which can be caused by bacterial or viral infections, malignancy, and other rare causes. Here are some possible causes of a lump on the back of the neck, based on the search results:
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Enlarged lymph nodes: This is the most common cause of lumps in the neck. It can be caused by bacterial or viral infections, cancer (malignancy), or other rare causes.
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Cysts: Cysts are small pockets of tissue filled with fluid, pus, or other substances. They can be caused by injury, infection, or other issues. Sebaceous cysts, also known as epidermoid cysts, are encapsulated subepidermal nodules filled with keratin. They are generally considered to be benign lesions, but rare malignancy can arise.
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Boils: Boils are painful, pus-filled bumps that form under the skin. They are caused by a bacterial infection and can occur anywhere on the body, including the back of the neck.
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Muscle knots: These are areas of muscle that have become tight and painful due to overuse or injury. They can feel like small lumps under the skin.
It is important to see a doctor if a lump on the back of the neck does not go away or if it is accompanied by other symptoms. The doctor may perform a physical exam, take a medical history, and order tests such as a biopsy or imaging tests to determine the cause of the lump.
