Our expert says:
It is difficult to say what the lump is without a visual examination. It could be from an insect bite, localized allergy, foreign body, small fatty mass/lipoma, abscess etc.
If it is not causing irritation then I would tend to leave the lesion alone. If you are unduly concerned then I would seek the advise of you local veterinary surgeon who will assist you in the diagnosis and treatment of the lump.
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