John G. LeVasseur, MD, FAAD

Board-Certified Dermatologist
Fellowship-Trained Mohs Surgeon
Fellow of the American Academy of Dermatology


Dr. John LeVasseur is a Board-Certified Dermatologist and Fellowship-Trained Mohs Surgeon in San Antonio, Texas at Mohs Skin Cancer Surgery of South Texas, now a part of U.S. Dermatology Partners.

Dr. John LeVasseur has practiced Mohs surgery and cutaneous reconstructive surgery for over fifteen years since completing his fellowship at the University of Colorado Health Sciences Center in Denver. His practice focuses on skin cancer evaluation and treatment, with most patients sent by referral from other physicians throughout South and Central Texas. He is a board-certified dermatologist and based on his training and experience is a Fellow of the American College of Mohs Surgery. Prior to joining this practice, he was a faculty member teaching dermatologic surgery and skin cancer cutaneous oncology at the military dermatology residency training program here in San Antonio.

  • B.S., United States Air Force Academy, Colorado Springs CO, 1986 (distinguished graduate)
  • M.D., Uniformed Services University of The Health Sciences, Bethesda MD, 1990 (top USAF graduate)
Post-Doctoral Training
  • University of Colorado HSC, Denver, Dermatologic/Mohs Surgery Fellowship, 1999-2000
  • Wilford Hall Med Center, TX, Dermatology Residency, 1994-97
  • USAF Medical Center Wright-Patterson, OH, Internal Medicine Internship, 1990-91
Licensure & Board Certification
  • Diplomate, American Board of Dermatology 1997, Recertified 2007, 2017, participating in Maintenance of Certification program
  • Licensed in TX, CO, MN
Hospital Appointments
  • Methodist Hospital, San Antonio, TX
Professional Standing
  • Fellow, American College of Mohs Surgery
  • Fellow, American Society for Dermatologic Surgery
  • Fellow, American Academy of Dermatology
  • Alpha Omega Alpha Honor Medical Society
  • USAF Special Experience Identifier Award, Academic/Clinical Grand Master, 2006
  • Association of Military Surgeons of the United States
  • Colonel, U. S. Air Force, Retired Oct 2010
Peer & Public Recognition
  • Best Doctors
  • Texas Super Doctors 2018
  • Consumers Research Council Guide to Americas Top Dermatologists
  • Montie Lewis Outstanding Resident in Dermatology Award 1997

Clinic Locations

Mohs Skin Cancer Surgery of South Texas
Mohs Skin Cancer Surgery of South Texas

5282 Medical Dr
San Antonio TX, 78229

(210) 615-8200

Services Offered By John LeVasseur, MD

What Is Basal Cell Carcinoma?

Basal Cell Carcinoma, also known as basalioma or basal cell cancer, is the most common type of skin cancer and carries the least amount of risk, though it still requires attention. If caught and treated early, basal cell carcinomas are not likely to be life-threatening, but they do have the potential to cause disfigurement of the skin tissue.

Almost one million new cases of basal cell carcinoma are diagnosed each year in the U.S., and up to 30% of Caucasians may develop basal cell carcinomas in their lifetime.

Basal cell carcinoma treatment

Basal cell carcinoma can be treated by removing the affected area.

Skin cancer is considered low risk when the affected cells remain clustered in a single group. Both basal cell carcinoma and squamous cell carcinoma are rarely life-threatening. Though it is unlikely to spread to other parts of your body, if left untreated, basal cell carcinoma can move into nearby bone or other tissue.

Basal cell carcinoma typically begins as a small, shiny bump on the face, although it can occur on any part of the body.

What Is Melanoma?

Melanoma, the deadliest of skin cancers, only accounts for about 4 percent of all skin cancer cases, but causes about 79 percent of skin cancer deaths.

Melanoma is a cancer of the skin that begins in the melanocytes, which are the cells that produce the pigment melanin. It is the leading cause of cancer death in women 25 to 30 years old and the second leading cause of cancer death in women 30 to 35 years old.

In some cases, melanoma occurs in melanocytes throughout the body, even if those parts have never been exposed to the sun.


What Is Mohs Surgery?

Mohs surgery offers the highest cure rates for all non-melanoma skin cancers. For certain cases of the most common types of skin cancer — squamous cell carcinoma and basal cell carcinoma — the cure rate can be as high as 99 percent.

Mohs surgery is a highly specialized surgical technique used to treat non-melanoma skin cancers in which the surgeon removes all of the visible cancer, plus a small margin of the surrounding healthy tissue and examines it to ensure that all cancer cells have been removed at the time of surgery.

Before and After Mohs Surgery Technique

The Mohs surgery technique treats skin cancers by removing all of the visible cancer. Image Source:

During Mohs micrographic surgery — named after Dr. Frederic Mohs, who first performed it in the 1930s — cancer is removed from the skin layer by layer until all cancerous cells have been removed. This type of surgery is most commonly used for cancers that have a high risk of re-occurrence. This technique allows for complete removal of the skin cancer while minimizing the removal of surrounding healthy skin.

What Is Skin Cancer?

Skin cancer is the most common form of cancer in the U.S. with more than 3.5 million cases diagnosed each year.

Skin cancer is the result of uncontrolled growth of abnormal skin cells that takes place when skin cells suffer DNA damage and then mutate, causing them to multiply rapidly and form malignant (cancerous) tumors. Most skin cancers develop on the visible outer layer of the skin (the epidermis), particularly on sun-exposed areas such as the face, head, hands, arms and legs. They are usually easy to detect with a skin examination, which increases the chances of early diagnosis.

There are different types of skin cancer, each named for the type of skin cell from which they originate. The most common type of skin cancer is basal cell carcinoma. Almost one million new cases of basal cell carcinoma are diagnosed each year in the U.S. Most skin cancers fall into one of three categories:

There are often warning signs that cancer is developing. The most common are pre-cancerous lesions called actinic keratoses that often develop on sun-exposed areas. These tumors replace normal surrounding tissue and generally do not spread to other areas.

Skin cancer is considered low risk when the affected cells remain clustered in a single group. Both basal cell carcinoma and squamous cell carcinoma are rarely life-threatening.

Skin cancer is considered a high risk when cells have invaded surrounding tissues. The third most common skin cancer, malignant melanoma, can be life-threatening if not diagnosed and treated early.

If skin cancer is detected before it has spread to surrounding tissues, the chances of a complete recovery and cure are excellent. High-risk forms of cancer like melanoma require more aggressive treatments.

Doctor removing mole from a patient's shoulder.

Suspicious moles should be watched closely, as they might indicate a cancerous growth.

What Is Squamous Cell Carcinoma?

Squamous Cell Carcinoma is a common form of skin cancer that develops in the squamous cells that make up the outer layer of the skin. Although it is usually not life-threatening, it can be aggressive in some cases.

If left untreated, squamous cell carcinoma can grow large or spread to other parts of your body, causing serious complications.

Dermatologist examining male patient's skin for signs of Squamous Cell Carcinoma.

Your dermatologist will be able to examine your skin for signs of squamous cell carcinoma.

Insurance Plans Accepted By John LeVasseur, MD

What Our Patients Say

John LeVasseur, MD
5 Stars  He was very informative what he and his nurse how procedure surgery will be performed –
Source : Healthgrades – Oct 15, 2021
John LeVasseur, MD
5 Stars  My experience at this office was spectacular! Dr. Levasseur and the staff went above and beyond " normal service" to ensure that I got the procedure in a timely manner. Probably the best " medical experience " I've had in recent memory! –
Source : Healthgrades – Oct 08, 2021
John LeVasseur, MD
5 Stars  I had a very wonderful experience with Dr.Levasseur and his staff! Very professional and friendly! –
Source : Healthgrades – Sep 25, 2021