It is difficult to talk of skin cancer in one block because there are different types with different evolution and prognosis. Basically one can oppose melanoma that has a general evolution to basal and squamous cell carcinomas that have a local or locoregional evolution.
However their local treatment has common points.
Because of the malign characteristic of these tumors it is important to have a security margin when taking them off. This margin’s importance varies with the type of tumor but is usually between a few millimeters and a few centimeters. This means that when one operates a tumor deemed very small by the patient, it is going to be necessary to take away quite a bit of tissue. These defects that can be spectacular, specially on the face,and be perceived as excessive by the patient, but there are necessary to diminish recurrence possibility.
Fortunately plastic surgery possibilities are important and these defects can be closed by simple healing, skin grafts or skin flaps.