Saggy loose skin under chin...turkey neck? (photo)

Congratulations on all of the weight loss. That's amazing. From the photo it's hard to know 100%, because it's clear that you now have loose skin, but unclear how much laxity there is in the muscle underneath as well. Most of the time the platysma, which is the muscle of the neck under the skin, is also loose, and needs to be tightened. That requires an incision underneath your chin that is well hidden. I would also recommend a full neck lift to remove the excess skin, which requires an incision around the ears to get rid of all of the excess and define your neck as it was when you were younger. Patient's tolerate it very well and are typically very happy with the results.
-Dr. David Mattos, New York Plastic Surgical Group

Congratulations on your recent weight loss! Losing nearly 75 pounds is a great achievement and can leave you with hanging skin and muscle bands (platysma muscle). 
A surgical necklift would be a great option for tightening the skin and underlying muscle. The scars are typically well-concealed around the ear and under the chin.  
Many patients in Minneapolis are surprised that there is not a lot of pain or discomfort after a neck lift. If you do experience significant pain then you should definitely get in touch with your surgeon immediately and let them know. Typically you can expect the initial swelling to increase a few days with the peak being postoperative day number three. After that it dissipates over the next two weeks. 
In general, you can expect about a week of bruising. Patients tend to feel pretty good and back to themselves in about 24 to 48 hours, but it’s extremely important to avoid any strenuous activity for at least one week after surgery. This means no exercise or activity that increases the heart rate, no sexual activity, no straining to use the restroom. 
By the end of the first week, most of the sutures will be removed, but a few may need to stay in place for another week depending on how you’re healing. This is completely normal and nothing to worry about. 
Most patients are able to return to work after two weeks because the bruising has subsided and the swelling is mostly gone. Makeup can be work after the first week to conceal any bruising or scars. 
It takes about 3 months for most of the swelling to resolve and for you to see your true results. Sometimes, certain areas of your skin may remain firm for 6-9 months and this can be improved with lymphatic massage or just waiting for it to subside. The scars fade by about 12 months after surgery. 

Best of luck,
Dr. Karan Chopra
★★★★★
Minneapolis Plastic Surgeon
Face ⨀ Breast ⨀ Body Expert
Johns Hopkins Trained
Cosmetic Fellowship Trained

Congratulations on your amazing transformation. I would recommend seeing a plastic surgeon in your area for assessment. It is likely that muscle tightening and skin excess removal are in your future, but there are many options for aesthetic improvement to the submental area. Options include lipo, face/neck lift, RF Microneedling with laser work. Good luck to you on your neck aesthetic journey!