Study to Evaluate Safety and Efficacy of ALLO-ASC-SHEET in Subjects With Dystrophic Epidermolysis Bullosa

This study is testing a stem cell skin sheet treatment (ALLO-ASC-SHEET) for people with dystrophic epidermolysis bullosa (DEB) — a rare inherited skin disease where the skin blisters and breaks easily, causing painful sores that are hard to heal. You may be eligible if: - You are 4–60 years old - You have a confirmed diagnosis of dystrophic epidermolysis bullosa (by genetic testing or immunostaining) - You have two open skin ulcer sores that are each 5–20 cm² in size - The sores show no signs of infection or dead tissue - You are willing to use contraception during the study if you are able to have children You may NOT be eligible if: - Your skin ulcer area has a bacterial infection requiring antibiotics - You are pregnant, breastfeeding, or sexually active without contraception and able to become pregnant Talk to your doctor to see if this trial is right for you.