Skin has one scent receptor tuned to the smell of Sandalwood. When those smell cells are turned on, skin will heal quicker. Think: Sandalwood incense.
The source for this is a Science Daily article:
Some 350 different kinds of smell receptor have been found in noses but a few show up elsewhere including intestines, prostate, sperm and now, the skin.
The technical report: The research team from Bochum found the olfactory receptor OR2AT4 present in keratinocytes that form the topmost layer of our skin and it triggered a calcium-dependent signal pathway which typically facilitates wound healing.