Dr. Michael Heffernan, Dr. Joseph Diehl and Cheryl Ketelsen PA-C are accepting new patients. Please call the office at (805) 541-2650 to schedule your new patient appointment today! All of our San Luis Dermatology providers are contracted with Medicare only. Although we’re out of network providers we do accept all patients and can bill most all PPO plans as a courtesy.
San Luis Dermatology, Inc.
State of the art skin care services, serving the San Luis Obispo area since 1977.
Now Accepting New Patients. Our providers accept Medicare.

Welcome to San Luis Dermatology
San Luis Dermatology has been serving the San Luis Obispo area in the person of Dr. Jeffrey Herten since 1977. From one doctor, one nurse, and one front office person practice, the clinic has grown into four physicians, one Physician Assistant, and twenty-five support staff practice, with three office locations in San Luis Obispo County.
Services
From acne to Mohs Micrographic Surgery - San Luis Dermatology does it all!

General Treatment
San Luis Dermatology has the experience and capacity to treat a wide range of common skin conditions. We look forward to helping you!

Skin Cancer
Successful treatment of skin cancer requires early detection, comprehensive examination and professional guidance.
Our team

R. Jeffrey Herten
M.D.

Michael P. Heffernan
M.D., FAAD

Charles B. Fishman
M.D.

Joseph Diehl
M.D., FACMS, FAAD

Cheryl Ketelsen
Diplomate Fellow, SDPA
Company News

San Luis Dermatology has expanded to North County!
We are delighted to announce that San Luis Dermatology has expanded our business with a…
Company News:
Dr. Heffernan directed the 3rd Annual Santa Barbara Dermatology Meeting in Ojai, CA November 11-14th, 2021.…
New Systemic Treatments for Psoriasis Panel
Dr. Michael Heffernan was invited to direct the New Systemic Treatments for Psoriasis Panel at the…