My wall drain pipe clears the vanity, but there is not enough depth for trap. That's why I am thinking running a 90 degree bend out of the wall upward. My concern is losing the trap seal.
Since wall drain pipe clears the vanity, I am thinking running 90 degree going up and then attaching the rest to the p-trap.
Not sure if this matters. Within the wall, drain pipe doesn't go straight down. It turns left and goes towards toilet.