Indent and line under chin 5 months post chin lipo (Photo)

Dear Persistent844205,
I understand your concern. However, without a proper assessment, it would be difficult to determine what went wrong. It is best that you visit your plastic surgeon for further assessment or ask for a second opinion. Only after a thorough examination, you can get proper recommendations and advice.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

Try using both thumbs and massage this area regularly, you are still early and things are evolving so try this and see if it will improve.