Is manuka honey commonly used to treat leg ulcer?

Not commonly: Manuka honey has been used as an adjunct to leg ulcer wound dressings. Its use has been studied and has not always been shown to be beneficial.

Honey: There are over four thousand wound care products on the market. None have been shown to be better or worse than another in studies. Antimicrobial dressings have not been shown to be better than similar products without antibiotics. Honey products have been shown to be as affective as other products; they seem to work very well in some patients that other products have not worked at all.