Yours is a congenital trait and removing the muscles would not work well for your neck and head. Botox is a safer thing that can be done to help decrease the size of the muscle. However, it will make the muscle a little weaker. You need these muscles.
This is a cobra neck deformity. This is related to excessive removal of the deep fat in between the platysma muscle bellies in the midline of the neck followed by dehiscence (separation) of the two platysmal muscle bellies from the midline repair. The fullness in the midline could be residual...
The whole area needs to be released and redrape the skin in a better way pulling more posteriorly than up for a smoother look. Go back to your surgeon and discuss this.
