Liquid applied to the skin (6)
I believe the answer is:
lotion
'liquid applied to the skin' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lotion that I've seen before include "Liquid equivalent to ointment" , "Liquid medicament" , "Medicinal or cosmetic liquid for skin" , "Liquid for washing the skin" , "Medicinal or cosmetic liquid preparation" .)