I agree with Dr. Banda that a fractional ablative laser is your best bet. The tissues of the neck and chest are sensitive and tolerate less energy than tissues of the face. Typically 2-4 treatments will result in appreciable change. However, change in skin tension and elasticity will take several months to manifest.
With regards to your overactive neck muscles, Botox can be a temporizing answer. I do agree that selective neck muscle transection would work and is something often performed in children who have a disorder known as torticollis, when physical therapy does not work to correct tightness. You should inquire from a therapist if you would benefit from therapy to your neck.
I agree that lasers each have their proponents. We use an Active FX laser which is a carbon dioxide fractional laser. Our patients are happy and visibly see results in a short time. Downtime is typically one week. Just do your research and you should do fine.
Dr. Shah
