This is a randomized-controlled trial comparing two ways of caring for wounds after Mohs micrographic surgery for skin cancer: skin substitutes, which are special wound-healing materials that may help wounds heal, and secondary intention healing, a common method in which wounds are allowed to heal on their own. This research is being done because we do not yet know which option leads to better healing after Mohs surgery. Patients will be randomized into one of two groups and receive either the skin substitute or undergo secondary intention healing.