Crossword Genius

A rash complaint (8)

Ross

I believe the answer is:

impetigo

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'a rash' is the first definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'complaint' is the second definition.
(impetigo is a kind of health problem)

Can you help me to learn more?

(Other definitions for impetigo that I've seen before include "unsightly condition" , "I omit peg to get the childhood skin infection" , "Contagious skin disease causing spots and yellow crusts" , "Contagious skin disease causing crusted spots" , "sickness" .)

I've seen this clue in The Globe and Mail.
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