Hi, and thanks for your medical question on eHealth forum!
Without examining the lump, it is difficult to comment what it is. Here is a list of possibilities of what it could be. The lump could be a prolapsed hemorrhoid, a skin tag, a benign rectal tumor, a rectal polyp, a rectal abscess, genital wart or a hematoma.
Since it is not painful it is not likely to be an abscess. Please consult your doctor for confirmed diagnosis. Hope this helps. Take care!
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