Absolutely your chin grows. These kids don't have enough experience to properly answer your question. I've been juicing for 20+ years... and my chin has grown to a thick Cromagnon like jute... I've also noticed my forhead has become very pronounced... slopping and distended. I use a lot of Equipoise (horse steroid) and I've noticed that after a few cycles this has stretched and extended my jaw greatly... making my jaw and nose a bit "horse like" if you will.
I personally like the "animal" appearence steroids have given me. It doesn't bother me at all that my arms got longer and my knuckles drag a bit on the floor; however, if appearence are important to you you may want to stick with very light cycles.