Skin can smell and incense may have healing power.

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.