Of course it can! Surgeons in Rome used it to help wounds.  It’s also anti-macrobial and will keep it clean. 

Check out this bit of a study asking this question. 
Can Cannabis Oil Help Heal Wounds?

https://news.google.com/news/amp?caurl=http%3A%2F%2Famp.livescience.com%2F57500-can-medical-cannabis-help-heal-wounds.html#a-19f1f24d-80b0-4ca9-aee8-a82f008b1738