Problems Henry covered up causing rash reactions (6)

I believe the answer is:

itches

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

'rash reactions' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for itches that I've seen before include "Feels tingling sensation in skin" , "Ethics (anag)" , "Tingles as skin may" , "They're in need of a scratch" , "They need to be scratched" .)

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