It's definitely not a juvenile commersoni as they really look nothing alike. The lure is wrong, the color pattern is wrong, the body shape is wrong, and the tail is wrong.
It's almost definitely
Lophiocharon trisignatus based on matching the above mentioned traits. The tail, lure, and pattern are the give-aways for this species.
http://www.frogfish.ch/species-arten/Lophiocharon-trisignatus.html
The pink growth is probably from rubbing on a bag or the glass and should heal up if the fish is healthy and the water is clean. I have had numerous frogfish with the same thing in the same spot and it's always gone away by itself.