In this project the investigators will treat bilateral hollowing with injection of autologous fat in one temporal region and hyaluronic-acid injections on the opposite side. Participants with unilateral hollowing will be randomized to one of the treatment options. Outcomes will be evaluated by clinical examination, photographs and ultrasound volume measurement at 6, 12, 18 and 24 months postoperatively. The participants will be retreated at these follow up intervals if necessary.