Thank you for your question. It is likely that this lump could be a sebaceous cyst. Sebaceous cysts form due to clogged sebaceous glands which can become enlarged with a purulent exudate (pus) and eventually become infected. This can eventually lead to the help formation of a draining absecess which can be very painful. At this point your cyst is not severely infected but may become so quite soon. For this reason, we recommend that you have your doctor examined it. It will likely have to be surgically excised and treated with oral antibiotics.
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