What Should I Do if I Have a Large Lump After Mohs Surgery?

There are many reasons to have the fullness, including a remote risk of a recurrence.  I would discuss the options for removal or repair with a qualified plastic surgeon. Raffy Karamanoukian, Los Angeles

Scar massage should be applied diligently 10x every 4-6 hours starting 3 weeks after Mohs surgery. If the affected post-op area remains hypertrophic, judicious low-concentration cortisone injection may be considered 3 months after surgery.

The cause of the bump could be a thickened scar, a cyst, a reaction to suture material and even recurrence of the skin cancer. Because of this last possibility, I would recommend that you see someone to evaluate the possibility of skin cancer recurrence. This is most easily done with a small incisional biopsy. Most skin cancers occur in the first two years after surgery, and while Mohs surgery does provide the highest cure rate for skin cancer, nothing is 100% perfect. So I would recommend seeing a doctor, preferably a fellowship-trained Mohs surgeon (i.e. member of the American College of Mohs Surgery), and confirm what is causing that lump. Once recurrence of the skin cancer is excluded the problem should be able to be improved. By the way if the lump is a recurrence, Mohs surgery is still going to give the highest cure rate for a recurrent tumor.