This disclosure describes a combined autologous biologic and cold therapy treatment for treating various skin injuries. The treatment may include applying autologous blood components, including but not limited to platelet rich plasma, to a skin injury in a manner that influences the healing process. A tray assembly for freezing autologous blood components includes a tray body and a plurality of compartments formed in the tray body. Each of the plurality of compartments is configured to receive an individual dose of an autologous blood component.