If your skin cancer surgery involved removal of a large malignancy, there will be noticeable scarring. How extensive it will be can be hard to predict, and depends in part on individual characteristics that are unique to each patient. For example, the way your body heals wounds is governed largely by your genetic inheritance. Some patients are more predisposed to develop keloids, scars that tend to be raised and often wide. Skilled surgeons performing a Mohs procedure take care to place incisions in areas that will be less noticeable, such as natural skin creases or wrinkles. Mohs surgery's technique of removing one thin layer of skin at a time, and checking each layer for the presence of cancer cells before going deeper, helps reduce the overall amount of scarring.
You as a patient will also play a role in minimizing the appearance of scars, by limiting sun exposure, applying prescribed topical medications and following your surgeon's post-operative instructions. Fortunately, you will not have to live with the scars you first notice soon after surgery - all scars gradually improve in appearance over the course of a year.