Spots name inside card (4)
I believe the answer is:
acne
'spots' is the definition.
(I've seen this before)
'name inside card' is the wordplay.
'name' becomes 'n' (common abbreviation e.g. on forms).
'inside' is an insertion indicator.
'card' becomes 'ace' (I've seen this before**).
'n' inserted inside 'ace' is 'ACNE'.
(Other definitions for acne that I've seen before include "(Inflammation causing) spots" , "Skin complaint" , "Spotty skin condition" , "Skin condition prevalent among teenagers" , "Skin problem, mainly of teenagers" .)