Notice zit (4)
I believe the answer is:
spot
I believe this is a double definition.
'notice' is the first definition.
(thesaurus)
'zit' is the second definition.
(I've seen this before)
(Other definitions for spot that I've seen before include "Catch sight of - pimple" , "Catch sight of mark in pots" , "Notice - fictional puppy" , "Dot, stain" , "Predicament" .)