In reply to Dax H:
Yes you should do but make it private and tactful.
I remember someone in work having really bad body odour. It got to the stage, where people were starting to complain to management and saying that they would refuse to work with him.
The Production Manager asked the Production Supervisor to have a chat with the guy, but as he was quite sensitive, to be subtle, tactful and discreet.
"Leave it to me" says Jeff.
Next thing, he goes into a busy canteen and says loudly to Mike "Mike, I don't want to offend you, but you're humming like a dog".