Contagious skin infection (7)
I believe the answer is:
scabies
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">contagious skin infection</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for scabies that I've seen before include "rash complaint?" , "Contagious skin disease that causes itching" , "Skin disease - "The Itch"" , "Contagious skin infection" , "Contagious skin disease causing itching" .)