Our Providers

Amy Litchfield

Amy H. Litchfield, M.D., F.A.A.D.

Dr. Amy H. Litchfield has been practicing dermatology in southern California since 2001. She obtained her undergraduate degree in chemistry from the Georgia Institute of Technology and earned her M.D. from the Medical College of Georgia.  She went on to complete her residency training in dermatology at the University of Louisville, Kentucky where she was elected to serve as Chief Resident.

She has been a board certified dermatologist since 2000, and was successfully recertified by the American Board of Dermatology. After practicing in San Francisco for a year, she and her husband relocated to southern California.
Dr. Litchfield’s practice encompasses adult as well as pediatric dermatology, surgical dermatology, cosmetic dermatology, and the use of lasers for both medical and cosmetic use.

Board Certification

  • American Board of Dermatology

Professional Memberships

  • American Academy of Dermatology
  • Dermatology Foundation
  • California Society of Dermatology and Dermatologic Surgery
  • Women’s Dermatologic Society

Personal Background

Dr. Litchfield grew up in Atlanta, Georgia and has since settled in Orange County where she lives with her husband, two daughters and son. She enjoys reading, snowskiing, traveling, and exercise. She also has a passion for children’s education and was a founding board member and Vice-President of the Splash Foundation at Concordia Elementary School in San Clemente www.splashfoundation.com She is also involved with the Mind Institute and the Discovery Science Center.

Hospital Affiliation:
Mission Hospital in Mission Viejo, CA


Hughes (Litchfield) AP, Callen JP. Drug induced linear IgA bullous dermatosis mimicking toxic epidermal necrolysis. Dermatology. 2001;202(2):138-9.

Hughes (Litchfield)AP, Jackson JM, Callen JP. Clinical features and treatment of peristomal pyoderma gangrenosum. JAMA. 2000 Sep 27;284(12):1546-8.

Malone JC, Sonnier GB, Hughes (Litchfield) AP, Hood AF. Poorly differentiated squamous cell carcinoma arising within an epidermoid cyst. Int J Dermatol. 1999 Jul;38(7):556-8.

Callen JP, Hughes AP, Kulp-Shorten CL. Terbinafine exacerbated/induced subacute cutaneous lupus erythematosus: a report of five cases. Arch Dermatol In press.


Southern Medical Association Conference presentation, Dallas 11/99:
Hughes (Litchfield) AP, Kulp-Shorten C, Callen JP. Erythema gyratum repens-like lesions as a manifestation of terbinafine exacerbated subacute cutaneous lupus erythematosus.

American Academy of Dermatology poster presentation, New York 1999:
Hughes(Litchfield) AP, Schrodt BJ, Callen JP. Epidermolysis Bullosa Acquisita Responsive to Dapsone Therapy.

Southern Medical Association Conference presentation, New Orleans 11/98:
Hughes(Litchfield) AP, McAllister S, Callen JP. Cutaneous lesions as a late yet Diagnostic Manifestation of Histiocytosis X.


Bryan Hiscox

Bryan Hiscox M.D., M.B.A.

Dr. Bryan Hiscox began practicing Dermatology in 2016. He has an undergraduate degree in English Language and Literature from Princeton University. He earned his MD from the David Geffen School of Medicine at UCLA, where he was elected to the Alpha Omega Alpha honor society. While at UCLA, he also received a concurrent MBA from the Anderson School of Management. He completed an internship at Scripps Mercy Hospital in San Diego, and did residency training in Dermatology at the Baylor College of Medicine in Houston, Texas. As a 3rd year resident, he was chosen by the faculty to serve as Chief Resident. Dr. Hiscox has broad interests in Dermatology, encompassing both medical and procedural dermatology.

A California native, Dr. Hiscox grew up in the suburbs of Los Angeles. He is excited to be back and practicing in Southern California. Outside of Dermatology, he enjoys cooking, reading, and being active outdoors – including backpacking, cycling, and triathlon.


  • American Academy of Dermatology
  • American Society for Dermatologic Surgery
  • Texas Medical Association
  • Harris County Medical Association


Leonardi MJ, Jamil KG, Hiscox B, Ross D, Hiatt JR. Abdominal surgery after lung transplantation. American Surgeon,76(10):1130- 1134, 2010.
Ngo B, Rongey C, Hiscox B, Rendell M, Woodley D, Smogorzewski M. Skin blood flow in patients with stage 5 chronic kidney disease on hemodialysis. Journal of Renal Nutrition, 20(5 Suppl):S89-94, 2010.
Hiscox B, Hu J, Young LC. A case of Morfan syndrome. Cutis. 95(3):E20-21, 2015.
Hiscox B, Fischer A, Rizk C, Subrt P, Hsu S. Intederminate Cell Histiocystosis Mimicking Rosacea. Accepted for publication, date pending, Dermatology Online Journal.


Hiscox B, Dao H. Lucio Phenomenon in Lepromatous Leprosy. Patient Presentation and Review at the Texas Dermatological Society Annual Meeting. Houston, Texas. March 2016.
Hiscox B, Hsu S. Pseudoxanthoma Elasticum. Case Presentation at the Knox Memorial Lecture. Houston, Texas. November, 2015.
Hiscox, B, Holcomb M. Cutaneous Myiasis with Dermatobia Hominis. Case Presentation at the Knox Memorial Lecture. Houston, Texas. November 2015.
Hiscox, B, Young, L. A possible Case of the Proposed MORFAN Syndrome. Poster Presentation at UCLA DGSOM Scholarship Day. Los Angeles, California. May, 2012.
Hiscox B, Cotliar J, Kim, J. Minimally Invasive Methods of Antimicrobial Peptide Detection in Skin. Poster Presentation at the Josiah Brown Research Fair. Los Angeles, CA. August 2008.


Polly Vallone, PA-C

Polly Vallone, PA-C

Polly Vallone, PA-C is a Certified Physician Assistant who received her degree at Stanford University. Polly completed her undergraduate degree at the University of California Santa Barbara where she majored in Biology. To maintain her certification, Polly completes over 100 continuing medical education hours every two years and takes her recertification board exam every ten years. These requirements enable her to stay current with the ever evolving practice of medicine.

Polly has been performing medical and cosmetic dermatology at a prominent Newport Beach dermatology office for over 10 years prior to joining California Coastal Dermatology. She treats sun-damaged skin, diagnoses and treats skin cancer, as well as an array of common dermatologic conditions such as eczema, psoriasis, rashes, warts, pigment disorders, alopecia, acne, and rosacea. She performs biopsies, excisions, C and D’s, and cryotherapy. She has a strong knowledge base of all types of lasers. Polly has been trained on pulse dye lasers, CO2, photofacial (IPL), hair removal, excimer, Erbium, Radiofrequncy, NdYag, blue light PDT, Fraxel and Ultherapy. She enjoys the art of fillers and Botox and strives to give her patients the best version of themselves by enhancing their natural beauty. Polly has extensive training with chemical peels, Botox, Juvederm, Voluma, Restylane, Sculptra and Belotero.

Her professional affiliation include membership in the Society of Dermatology Physician Assistants, American Society for Laser Medicine and Surgery, and the American Academy of Physician Assistants. Polly is licensed to practice dermatologic medicine by The Medical Board of California. She is warm and personable. It is obvious when you meet her, she truly enjoys what she does. Polly makes long lasting relationships with her patients. She likes to spend her free time with her three children and her husband.


Mary Joan Greffin, RN

Mary Joan Greffin, RN

Mary Joan Greffin is a board certified registered nurse with over 20 years of experience in the specialty of cosmetic dermatology. She is a member of the Dermatology Nurses Association. Mary Joan has worked closely with dermatologists performing cutting edge medical and cosmetic procedures. Mary Joan has years of experience with many laser procedures, injectables such as Botox, Juvederm and Voluma, chemical peels, and cosmetic skin care. Mary Joan is devoted to helping you achieve your best self. She lives in Orange County with her husband and is the mother of 3 children. She enjoys working out and spending time with her family.


Rebecca Belyea

Rebecca Belyea

Rebecca Belyea has been a certified medical aesthetician for over 14 years. She graduated from Paul Mitchell the Skin Academy. She has always had a love for skincare and passionate about achieving the best results for her patients. She continues to further her education with the latest technology and procedures in the medical field of skincare. Rebecca utilizes a variety of custom peels. HydraFacial MD, facials, acne treatments.