Flood spots not given due care (4)

I believe the answer is:

rash

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

This clue could be a double definition.

'flood' is the first definition.
(I've seen this before)

'spots not given due care' is the second definition.
'rash' can be an answer for 'spots' (as in skin irritation). I am not sure about the 'not given due care' bit.

Can you help me to learn more?

(Other definitions for rash that I've seen before include "Overhasty - skin irritation" , "sign of irritation?" , "Headstrong" , "Harum-scarum" , "spate" .)

I've seen this clue in The Times and The Sunday Times.

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