I Had Mohs Surgery on my Scalp Which Left Me with a Bald Spot. Is This Common?

Freezing or burning of a skin cancer are other alternatives; however, Mohs will give the highest cure rate and preserve the greatest amount of healthy tissue. The two other alternatives that you mention would actually have a higher risk of scarring or damage to the surrounding hair. The "baldness" is not related to the Mohs surgery. It is most likely related to the repair that was done afterwards. It's unclear as to how long ago the procedure was performed but sometimes you can have some temporary hairloss afterwards. This is because the nearby hairs were put into a sleep phase and shed after the procedure. In that case the hairs start to return 3-6 months later. If the surrounding hairs were physically damaged during the repair process the hair loss may be more long-lasting. Talk to the doctor who performed the surgery as to what is the cause of the baldness and what if anything can be done.

Mohs surgery remains the best option for treatment of a skin cancer on a hair bearing area.  Because Mohs surgery is tissue sparing, the final defect is more likely to be shallower and smaller then with a standard excision yet lead to the complete tumor removal. 

On occasion, shallow wounds on scalp with intact hair follicles are allowed to heal on their own. Since hair follicles are necessary for hair regrowth, the wound is then covered by the newly grown hair. If the depth of the wound was deeper than the location of hair follicles, then the area will be bold unless reconstructed with stitches. However, a form of reconstruction called skin grafting will also result in a bold spot.

With regards to your current tumor, you may want to ask your surgeon to consider stitching the area to minimize the risk of the bold spot formation. The bold area may also be excised and reconstructed so that you have as little hair loss as possible.