(to produce) a mark etc. that spoils the beauty or perfection

flaw

small swelling under the skin filled with liquid (caused by rubbing, burning etc)

swelling

a hard, painful and poisoned swelling under the skin

blister

a swelling on the large joint of the big toe

physical growth; lump

a red (usually painful) inflamed swelling under the skin

abscess

a small mark, especially one of many feathers etc

dot

a small round mark on a surface; a dirty mark; a small drop (of liquid); a particular place; to recognize or notice (a person, thing) suddenly; to mark something with spots

mark, stain