Well, this is gross ...
Luke Rockhold's body is covered in some weird red, blotchy rash ... and he tried to rub it all over Daniel Cormier.
The UFC superstar SWEARS he got the skin condition thanks to "wet cupping" therapy -- where suction cups are placed on parts of the body and then lanced with a special needle.
It's essentially a controlled bloodletting that leaves nasty skin marks. It allegedly helps to orelieve pain.
Even though it looks like some sort of infectious disease, Rockhold insists it's not contagious (it's not) -- though that didn't stop him from freaking out D.