Skin disorder (4)
I believe the answer is:
acne
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">skin disorder</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for acne that I've seen before include "Adolescent spots" , "Cane for the teenager?" , "Pimply skin condition of adolescence" , "Facial spots" , "Spotty skin condition" .)