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Slight swelling may appear if there is a difference in muscle tone, distension of colon with gas.
Those can be soft in feeling.
As you do not feel any pain or tenderness & both the doctors could not find any mass or lump on palpation, there is unlikely to be any thing serious.
Still if you are worried, an ultrasound examination can be taken.
You can discuss it with your doctors.
I hope this information helps.
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