Does my chin need soft tissue removal to get rid of a hard ball in the center of my chin after a sliding genioplasty? (photos)

Could be scar tissue, could be bone in excess, could be the screws that are used, could be a loose plate or screw.  A video or in person consultation will help tremendously.

It is difficult to provide advise without profile photos as well as the details of the ages of the photos that were provided. Some of the photos appear to be from several years ago. I would not say that you have a witches chin deformity. The area slightly lateral to your chin is slightly depressed and consistent with aging and the pre-jowl sulcus. This is an area that is frequently addressed with fillers. I would not recommend the removal of any soft tissue at this time.

Hi,
I think you need a bony reduction or shaping more than a soft tissue shaping. Also, the soft tissue mainly includes the mentalis muscle, the soft tissue reduction may lead to asymmetries over the lower half of your mouth.
But of course, the best way to give a consultation is by a face-to-face consultation with a plastic surgeon.
Best wishes,

the reason your chin looks bigger or more ‘witchy’ is because the genioplasty pushed the bone forward. There are some non surgical ways with fillers to treat this but sometimes revision surgery is needed. Consider a consultation to discuss the details. 

It would be helpful to know the dimensional movements of your sliding genioplasty as well as see postoperative x-rays. Having a 'hard ball' in the center of the chin that feels different than the rest of the chin skin suggests where the fixation plate is located. Otherwise you do have an otherwise enlarged/swollen soft tissue chin pad compared to your preoperative picture. This is unusual as bringing the bone forward would be expected to stretch the soft tissue chin pad and is not a known cause of a witch's chin.  

I would return to your surgeon if possible to discuss your concerns and also request a copy of your operative report and have an in person examination. I would not suggest soft tissue removal as this can lead to asymmetries. Best regards, Michael V. Elam, M.D.