The plumping your getting is probably just from moisture, but if you keep using it on your face it might end up permanently plumped by fat. Some of the fat in a women's face is estrogenic, which means it might grow in response to increased estrogen. On the other hand, I have never heard of this actually happening to anyone, so there might be some unknown mechanism that prevents it from happening, but I personally wouldn't take the risk. Some PM companies do sell PM creams for the face, but they're much weaker than the boobie creams, and they're usually recommended for Menopausal women some of whom have already lost most of the estrogenic fat in their faces anyway. That might explain why there aren't a ton of people walking around with fat faces from PM cream

Whenever I have too much PM cream on my hands, I rub it on an area that's dry but doesn't have much estrogenic fat, usually my calves.