Mohs micrographic surgery

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Mohs micrographic surgery is a highly specialized procedure for the complete removal of skin cancer.

This method differs from all other surgical methods of treating skin cancer. Detailed mapping techniques and complete microscopic examination of 100% of the tissue margin removed allows the surgeon to remove every cancer cell. In contrast, standard surgery techniques look at <1% of the margins, providing only an estimate of whether the margins are clear.

The South Texas Skin Cancer Center, headed by Dr. Ryan O’Quinn, is a referral center that receives patients from dermatologists, plastic surgeons, oculoplastic surgeons, oncologists and primary care physicians from San Antonio, the Texas Hill Country and the entire South Texas region.  Dr. O’Quinn is a board-certified dermatologist and fellowship-trained Mohs surgeon who specializes in the prevention, early diagnosis, and definitive treatment of skin cancers.  He has treated many thousands of challenging malignancies since beginning his private practice in 2002.  Dr. O’Quinn very much enjoys the clinical side of medicine and is fully dedicated to providing the best care for his patients.




 The purpose of this website is to acquaint you with our practice, provide information regarding your diagnosis and treatment options, and to prepare you for surgery if necessary.  You can begin by reviewing the online surgery brochure to the left of the screen. You can also read more about Mohs surgery and Reconstructive procedures on the menu bar above.  If you want to review more information about your diagnosis, investigate the Skin Cancer tab on the menu bar above.  You can also learn more about protecting yourself from more skin cancers in the Prevention tab on the menu bar above.

 We hope you find our site to be informative.  Please feel free to contact us with any other questions you may have regarding your medical care, fees, insurance or other office policies.

***COVID-19 Update

Due to current recommendations for social distancing, we are not allowing family members to wait in the waiting room. 

Please leave your name and cell phone number with the front desk and we will update you about your loved one throughout their visit. 

For more information and updates on the situation, we encourage you to visit the following websites:


-U.S. Centers for Disease Control at

-U.S. National Library of Medicine at

-World Health Organization at

For any other questions or concerns please feel free to contact us at 210-558-6234.

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To Schedule An Appointment

Call: 210.558.6234