From the description it appears that you may be having a inflammatory reaction to the bite.
Usually such lumps subside within a few days post the bite. Since it is persisting for a long time, use of OTC anti-inflammatory medications like Advil might be helpful.
In presence of signs like redness, pain, and severe edematous swelling, the lump may be due to formation of a abscess due to secondary infection. In such a situation, you may need to consult a doctor for a examination and prescription of antibiotics to clear the infection.
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