grows on you -- like a rash . 
(ROOT (S (VP (VBZ grows) (PP (IN on) (NP (PRP you))) (, --) (PP (IN like) (NP (DT a) (NN rash)))) (. .)))
(ROOT (S (VP (VBZ ) (PP (IN ) (NP (PRP ))) (, ) (PP (IN ) (NP (DT ) (NN )))) (. )))