Mohs surgery involves the systematic removal and analysis of thin layers of skin at the tumor site until the last traces of cancerous tissue have been eliminated. The immediate and complete microscopic examination and evaluation of excised tissue is what differentiates Mohs surgery from other cancer removal procedures. Only cancerous tissue is removed, minimizing both post-operative wound size and the chance of regrowth.
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Depending on their depth, location and color, as well as the patient's skin type, age and other factors, treatment for benign but unattractive birthmarks may include surgical excision.