Synonyms of 'knurl'
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Bulges are lumps that stick out from a surface which is otherwise flat or smooth.
Why won't those bulges on your hips and thighs go?
A lump on or in someone's body is a small, hard swelling that has been caused by an injury or an illness.
I've got a lump on my shoulder.
Thesaurus for knurl from the Collins English Thesaurus
to impress with a series of fine ridges or serrations