Crossword Genius

Gravel rash? (8)

Ross

I believe the answer is:

shingles

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

This might be a double definition.

'gravel' is the first definition.
(I know this)

'rash?' is the second definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for shingles that I've seen before include "Herpes zoster" , "Viral inflamation, with rash of painful blisters" , "Painful virus disease or roof tiles" , "Kind of roof-tiles, or painful disease with rash" , "Viral inflammation with rash of painful blisters" .)

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