blemish – a mark or flaw that spoils the appearance of something

(Pronounced blem-ish)

To remember the definition of the word blemish, use the following mnemonic:

Blending a mishmash (blemish) of food without the top on will leave marks everywhere and spoils the appearance of any kitchen. 

Examples of blemish in a sentence

She couldn't clean the blemish off the mirror no matter how hard she tried.

The small blemish greatly reduced the antique's value.

The large blemish on the lens made the camera useless.