Pimply skin condition (4)
I believe the answer is:
acne
'pimply skin condition' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for acne that I've seen before include "Cane for the teenager?" , "Spotty coverage" , "Spotty skin condition" , "Inflammation of glands in skin" , "Skin rash" .)