Yellowish skin imperfections on the rise (5)
I believe the answer is:
straw
This could be a double definition.
'yellowish' is the first definition.
(thesaurus)
'skin imperfections on the rise' is the second definition.
The definition and answer can be both substances as well as being singular nouns.
Perhaps there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for straw that I've seen before include "Bedding material for horses etc" , "The last one broke the camel's back" , "In the wind, it's an indication" , "Means to absorb" , "Pale-yellow - through which one can drink" .)