Pimple (4)
(Other definitions for acne that I've seen before include "Skin problem, mainly of teenagers" , "Skin rash" , "Skin spots" , "Skin affliction" , "Cane for the teenager?" .)
'pimple' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for lump that I've seen before include "Large piece without definite shape" , "Large piece without defined shape" , "growth" , "Plum in a compact shapeless mass" , "Small heap, swelling" .)
'pimple' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for spot that I've seen before include "Notice; sign of acne" , "Discern - mark" , "Espy; mark" , "See 5" , "moral flaw" .)
'pimple' is the definition.
(I know that pimple can be written as zit)
This is the entire clue.
(Other definitions for zit that I've seen before include "Spot (colloq., mostly US)" , "Pimple (US)" , "Spot or pimple" .)