Sand Lake Dermatology Center

7335 W. Sand Lake Road, Suite 200
Orlando, FL 32819
(407) 352-8553

At Sand Lake Dermatology Center, we recognize that your choice of a medical provider is likely driven by competency and personality. You need a dermatologist who is experienced, understanding and supportive. You get this caring attitude from all of the staff at Sand Lake Dermatology Center. Having all of our providers work together in one office allows us to utilize a team approach, with physicians, physician assistants and nurses collaborating to provide the best care for each patient.  We look forward to getting to know you!

Christopher P. Crotty, M.D.

Board Certified, American Board of Dermatology
Board Certified, American Board of Dermatology and Pathology

Dr. Christopher P. Crotty is a Mayo Clinic-trained dermatologist and dermopathologist with extensive training and practice in internal medicine, dermatology, pathology and surgery. Dr. Crotty attended the University of Nebraska School of Medicine after completing his undergraduate degree at Notre Dame University. He completed a residency in internal medicine at Denver's Presbyterian Medical Center followed by a residency in dermatology at the Mayo Graduate School of Medicine in Rochester, Minnesota. While at the Mayo clinic, Dr. Crotty studied under Dr. Fred Mohs where he learned the Mohs micrographic surgical technique. Awarded the prestigious Osborne Fellowship, Dr. Crotty continued his studies in dermatopathology under the tutelage of Dr. A. Bernard Ackerman at New York University.

After six years of practicing dermatology and dermatopathology in Omaha, Nebraska, Dr. Crotty moved to Orlando and established Sand Lake Dermatology Center in 1988. A former president of the Central Florida Society of Dermatology, Dr. Crotty has served as an active participant since 1991. He is a member of the Leader's Society of the American Academy of Dermatology, the Sorin Society at the University of Notre Dame and the Doctor's Mayo Society. Dr. Crotty is very active throughout the Central Florida community, serves on the admission committee of the UCF School of Medicine and is also Assistant Professor at the UCF School of Medicine.

View Dr. Christopher P. Crotty's full biography here.

Allison K. Arthur, MD

Board Certified, American Board of Dermatology
Board Certified, American Board of Dermatology and Pathology

Dr. Allison Arthur is a Mayo Clinic-trained dermatologist and dermopathologist who cares for patients of all ages.  She is an expert in medical and surgical dermatology and is board certified by the American Academy of Dermatology.  Her goal is to deliver high quality, compassionate patient care.

Born and raised in Toledo, Ohio, Dr. Arthur moved to Atlanta, Georgia to complete her undergraduate studies at Emory University, where she was selected for membership in the Phi Beta Kappa Honor Society.  While attending medical school at the University of Florida, she was inducted into the Alpha Omega Alpha National Honor Medical Society and Gold Humanism Honor Society in recognition of her superb scholastic performance, personal character, and service to the university and the community.  In 2006, she graduated from the University of Florida College of Medicine at the top of her class with Honors in Academic Excellence.  She completed her internship in Internal Medicine at Shands Hospital at the University of Florida, then moved to Rochester, Minnesota for Dermatology residency at Mayo Clinic. 

After residency, Dr. Arthur joined the faculty of the Department of Dermatology at Mayo Clinic and served as an instructor at Mayo Medical School.  She then continued her education with a fellowship in dermatopathology, studying skin diseases at the microscopic level.  During her time at Mayo Clinic, Dr. Arthur cared for patients from all over the world and was mentored by some of the top dermatologists in the field. 

At the conclusion of her dermatology fellowship in 2012, Dr. Arthur moved to Orlando with her husband and two children in order to be near her parents and sister, who reside in Windermere.  She is delighted to join Dr. Christopher Crotty and the staff at Sand Lake Dermatology in providing outstanding dermatologic care.

Gina Mangin, MPAS, PA-C

Gina has been a practicing Physician Assistant for 15 years. She earned her Bachelor's degree in Biology from the Univeristy of North Carolina at Wilmington and received her Physician Assistant training at East Carolina University. She is board certified by the National Commission on Certification of Physician Assistants. Gina went on to earn her Masters of Physician Assistant studies at the University of Nebraska. Gina specializes in the treatment of all skin, hair and nail disorders. She also performs cosmetic procedures including Botox, intense pulsed light photorejuvenation and injectable fillers. Gina is an active member of the Society of Dermatology Physician Assistants and is an active board member and past President of the Florida Society of Dermatology Physician Assistants. She has earned the high honor of "Diplomate" status within the National Society of Dermatology Physician Assistants. 


Theresa Helsel, MS, MPAS, PA-C

Theresa Helsel manages disorders of the skin, hair and nails in adults and children and also performs aesthetic procedures such as Botox, dermal fillers and laser procedures. She is board-certified by the National Commission on Certification of Physician Assistants and is an active member of the Florida Academy of Physician Assistants, American Academy of Physician Assistants and Florida Society of Dermatology Physician Assistants. Theresa earned a Bachelor of Science in health and human performance at Brigham Young University, a Master of Science in sport and exercise science from the University of Florida and graduated with honors from Nova Southeastern University with a Master of Science in physician assistant studies. Theresa has also served as medical staff for Camp Discovery, a camp for children with severe skin conditions that is subsidized by the American Academy of Dermatology.

Theresa grew up in and has strong ties to the Dr. Phillips community. She is pleased to be joining her mother, Judy, who has worked for Sand Lake Dermatology Center since the practice opened 26 years ago as a nurse provider and director of patient care.

Jessica Holland, MPAS, PA-C

Jessie Holland is the newest medical provider to join Sand Lake Dermatology Center, though she is not new to medicine or dermatology. After growing up in Tampa, Florida, Jessie received a Bachelor's degree in excercise physiology at Florida State University. Jessie initially worked in rheumatology after graduation and went on to earn a Master's degree in Physician Assistant Studies at the University of Florida. Jessie completed her clinical rotations through the Orlando Regional hospital system and has since been practicing as a physician assistant specializing in pediatric and adult dermatology for the past four years. Jessie serves as the director-at-large for the Florida Society of Dermatology Physician Assistants and is also a member of the Society of Dermatology Physician Assistants, American Academy of Physician Assistants and the Florida Academy of Physician Assistants. 

Nancy Foster, Esthetician

Nancy Foster is a certified and licensed esthetician with over 20 years of experience in the esthetic field.  She believes in results-oriented treatments and pays personal attention to each patient's primary goals for their skin and esthetic needs. Nancy's extensive training and experience includes chemical peels, microdermabrasion, photo rejuvenation, skin tightening, oxygen facials as well as her vast knowledge of skin care products for various skin types. She believes that skin improvement is absolutely attainable at any age or stage of life. Nancy is available for complimentary consultations to offer individualized recommendations for services and products to meet your skin care needs. As Nancy says,  "Treating skin is an art that I tend to with diligent care. It is an honor for me to be entrusted with a person's face."


In addition to our medical providers, Sand Lake Dermatology Center features an elite team of staff members that are dedicated to addressing your dermatologic needs.

Patti Fitzgerald-Belisle, Practice Administrator
Patti Fitzgerald-Belisle wants you to choose Sand Lake Dermatology Center for all of your dermatologic needs. She ensures this by offering the ultimate patient experience—a combination of compassion and professionalism that she has developed through 23 years of experience in dermatology practice management, patient relations and customer care. Patti has had the pleasure of working with Dr. Crotty for 18 years and is thrilled to be a part of the team at Sand Lake Dermatology Center.





    "The best interest of the patient is the only interest to be considered."                
    ~Dr. William J. Mayo