In fact, the mouth is more bacteria,

If it is your husband's lower body has mold may be due to the following reasons:

1.

Mouth is not clean, the best thing is to brush the teeth or gargle every time beforehand

2.

Maybe the mouth with the time, the teeth are not

Maybe the teeth were not careful when you used your mouth and rubbed the skin, which made it easy to get infected, or maybe there was mold on your hands or on your clothes, such as socks

3.

Maybe you had it in the past, and this time using your mouth was the catalyst that accelerated the reaction

Clean the mouth with saline solution

The mouth is not clean, but you can use it as a base.