Skin disease (8)
I believe the answer is:
impetigo
'skin disease' is the definition.
(I know that impetigo is a type of skin disease)
This is all the clue.
(Other definitions for impetigo that I've seen before include "Contagious skin infection common in children" , "Contagious skin disease causing spots and yellow crusts" , "Contagious skin disease with spots forming yellow crusts" , "Contagious skin disease causing crusted spots" , "unsightly condition" .)