If its a surgical wound don't add the table version of the UMF manuka honey, use the sterilised version.
http://www.comvita.co.uk/medihoney/medihoney-first-aid/antibacterial-wound-gel.html
The sterilised version is safer for open wounds.
Manuka Honey comes in various strengths 5+ is usually just for toast 10+ and higher starts to help with medicinal issue.
The food grade should only be used internally purely as our bodies can handle the bacteria, if any in the honey (however, some people do use this on small...
The beekeeper is correct all honey has antibacterial activity, however studies have shown Manuka Honey has higher levels, this is measured in the 5+, 10+, 15+. The higher the UMF rating the higher the potency.
If the wound is closed then used the highest rating and smoother on top. If the...
The strongest manuka honey has been tested for its antibacterial activity, and has UMF logo on the product. The Unique Manuka Factor is the strength of the manuka honey. For deeper wounds use sterilised manuka honey, this works wonders.