Han Sen didn't lie to Saint Fan, as his body truly had developed a problem.
The ugly biomass had developed a number of unhealthy blisters. They were empty, but they produced deep craters across his body when popped.
These blisters began to appear more and more, honeycombing the mutated being like some beehive. The gross sight of Saint Fan was only becoming more garish and twisted.
"Impossible! My body is fine; I can heal..." Saint Fan was speaking from many of the mouths that composed his body.
He had no idea when this had begun, and the wounds that were webbing their way across him had sprung up on him with surprising speed. It didn't seem as if he would have noticed, had Han Sen not pointed the issue out to him.