(NEXSTAR) – A video of Joe Biden taken in Delaware over the holiday weekend appeared to show a scar on the former president’s forehead, prompting a spokesperson to reveal that Biden recently underwent Mohs surgery.

Mohs surgery, also known as Mohs micrographic surgery, is a procedure commonly performed on patients with certain types of skin cancer. Developed by American surgeon Frederic E. Mohs in the late 1930s, it’s “considered the most effective technique” for surgically treating basal cell carcinoma and squamous cell carcinoma, the Skin Cancer Foundation writes.

During the procedure, layers of skin containing cancerous cells are surgically removed a little at a time, after which the surgeon will analyze each layer until no cancer is detected in the tissue. This allows surgeons to spa

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