5 weeks post neck/facelift. I still have a bruise and hard lump/swelling behind my chin. What can be done to fix this? (Photo)

From the photograph alone it looks as though you had a small hematoma under the chin that is now organized. This will improve with time. Remain patient.

Your healing process in general can take up to one month for the majority of swelling to subside, incisions to close, sutures to come out, and for bruising to completely go away. #Recovery time from a #facelift varies from person to person, but patients can generally expect to be presentable within three weeks from surgery. Patients should expect swelling, bruising, and discoloration of the skin during this phase of recovery (swelling normally goes down after 48 hours; most bruising will go away within two weeks). When the skin is separated from the underlying tissues during surgery, small sensory #nerves are cut. Varying degrees of numbness will be present after surgery and will improve gradually as the nerves reconnect to the skin. This process can take from 2-6 months for face, neck and cheeks, and to 9-12 months for the forehead and scalp. Muscle weakness may also be present around the mouth especially if liposuction is used. This typically recovers fully in the months after surgery. 

As the nerves regenerate, the itching, burning, tingling and shooting #sensations will occur. Ice, moisturizers and gentle #massaging are helpful during this phase of the #healing process. Frequently there is a tight feeling in the neck, jawline and cheek after a facelift. During surgery, not only the skin but the underlying muscles are tightened to create a better and longer lasting result. Additionally, the #swelling will move downward in the first week and the neck will feel even tighter. Do not be alarmed: the sensation will decrease during the first month. 

Some degree of firmness or lumpiness under the skin is normal after surgery and will resolve with time. Local #massage of the areas may accelerate the resolution of this problem, which normally takes 2-4 months to disappear completely.The marks from a facelift can easily hidden with “camouflage” make-up which you can learn how to apply. The scars from a facelift mature within six to twelve months from the surgery date. It is during this time that the rejuvenating effects of the facelift will become apparent and the real result will be seen. If you have certain concerns about the procedures and #healing process, it is recommended to call your board-certified surgeon or their medical staff and discuss those #concerns.

You likely have a hematoma in the area.  I would recommend draining it in the office. Draining it will resolve this issue promptly.  You also appear to have a hematoma near your earlobe that may benefit from drainage as well.