Skin complaint? Heart has broken! (4,4)
I believe the answer is:
heat rash
'skin complaint?' is the definition.
(I've seen this before)
'heart has broken' is the wordplay.
'broken' indicates anagramming the letters.
'heart'+'has'='hearthas'
'hearthas' anagrammed gives 'HEAT RASH'.
(Other definitions for heat rash that I've seen before include "skin complaint" , "Irritating inflammation of sweat glands" , "Itching of the skin, caused by humid hot weather" .)