In this demo we simulated the formation of a small piece of skin tissue from several epithelial stem cells. A stem cell can stay in the basal layer and divide asymmetrically to produce one progenitor cell and one stem cell; progenitor cells will undergo cell division and form specialized keratinocytes, the dominant type of epidermis cells. The skin will stay at a certain thickness when the balance between cell death and cell generation is reached. Through optimizing the demo by generating different cell types, controlling initial stem cell density and adjusting cell growth, differential rate, the simplified simulation can provide a visual simulation of potential result of skin regeneration.