Talk to Pediatrician on Pimple/benign Neck Cyst In Infants

Hello. My daughter is 10 weeks old and she has this (attached) pimple-like thing on her neck since the day she was born. I showed it to a renowned paeds doctor and he asked me to just sit back and wait for it to go away on its own as, according to him, its a benign cyst that is common in infants. Please have a look and suggest if the doctor is right or if there is something I can do to treat it. Thanks