system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do small, superficial wounds heal faster on certain areas of the body, like the mouth, than in other areas?
gpt
The mouth is special for two reasons, one it contains certain chemicals that aid wound regeneration and saliva, saliva provides moisture, cleaning/defence and more good chemicals. 
In the rest of the body, it differs, certain places in the body have worse blood flow, which inhibits wound regeneration.  The dimensions of the wound are important too, if it’s a cut ; it’s easier to heal, as less time/material is required to make a ‘block’. If it only perforates the skin layer (epithelium) and not go further it is also preferable as epithelium grows quickest, if it perforated deeper, into the connective tissue, where you have Nerves and blood vessels, regeneration is gonna take longer.