Fig. 2.

The procedures of human acellular amniotic membrane (HAAM) implantation in the defect of ala nasi and representative cases of the wound healing at the control and the HAAM implantation groups. a Excision of the lesion. b Cutting the HAAM into small pieces for implantation. c Pieces of HAAM were placed into the bottom and wall of the defect. d-f Wound healing process of the patient of the control group. g-i Immediately after excision, 3 days after HAAM implantation and 3 months after HAAM implantation. e More bleeding made thicker scab in wound in the control group, which would hinder the formation of granulation tissue and the creep of epidermis. h The scab was much thinner and wetter to form more granulation tissue. f, i After the scab detached from the wound at 3 months postoperatively, the scar after HAAM treatment was much shallow than that of the control group