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Swollen Lymph nodes
The lymph nodes are part of the lymphatic system that is part of the immune system. Lymph nodes often swell in response to infection or disease. Sometimes this is somewhat inaccurately called "swollen glands" (lymph nodes are not glands; they do not secrete anything). The most common locations of lymph node swelling are in the neck, groin and underarm, though many other locations are possible.
Numerous conditions and infections can cause swollen lymph nodes including:
Common cold
Infections
Viruses
OR it could even be this...
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The lump could be what is known as a sebaceous cyst – a build-up of the oily substance secreted in hair follicles. Sebaceous cysts usually just disappear on their own, though they can require treatment if they become infected and sore.
Would probably be best to get it checked out to find out exactly what it is! And also tell me cause my next visit to GP isnt for another 4 wks