Knott Street Dermatology provides quality skin, hair, and nail care incorporating current medical and surgical practices for optimal dermatological health. With a primary focus on treating skin
cancer, we offer Mohs Surgery and an in-house pathology laboratory. Knott Street Dermatology also has an aesthetic department offering a full array of cosmetic procedures. Our providers accept most insurance carriers, and are available in two locations to treat all of your skin, hair, and nail needs.




Dr. Eric L. Hanson earned his undergraduate degree from the University of Illinois. He received his medical degree in 1994 from Tufts University School of Medicine in Boston, MA, graduating with the distinction of Alpha Omega Alpha. He then completed a transitional internship at the Naval Medical Center in San Diego, CA, followed by a four-year military commitment with the US Navy in Groton, CT as an Undersea Medical Officer. While serving the diving and submariner community, CDR Hanson received many medals and commendations, including those honoring his service as a US Navy Diver, as well as his medical support for the Salvage Operation of TWA Flight 800 off the Long Island coast.

Dr. Hanson completed his dermatology residency at the University of North Carolina at Chapel Hill where he was named Chief Resident in 2002.

Dr. Hanson is a board certified dermatologist and is actively affiliated with the American Board of Dermatology, American Academy of Dermatology, and the American Society of Mohs Surgeons. Dr. Hanson commutes to work on foot or by bicycle. He enjoys playing the guitar and brewing his own beer.


Mara Limoncelli graduated from D’Youville College in Buffalo, NY with a combined Bachelors/Masters in Physician Assistant studies. She began her career working at an urgent care in Burlington, Vermont before moving to the Portland area in 2012 to join a family medicine practice. Mara had the opportunity to work alongside Dr. Hanson at an outside facility during this time, which began her interest in specializing in dermatology. She joined Knott Street Dermatology in 2016, and has had extensive training and mentorship by Dr. Hanson. Mara is board certified member of the National Commission on Certification of Physician Assistants and an affiliate of the Society of Dermatology Physician Assistants. Outside of the clinic Mara enjoys trail running, hiking, traveling and adventures with her border collie.


Craig Schultz graduated from the University of North Dakota with a Bachelor of Science in Nursing, and went on to spend 5 years working in emergency departments throughout central Washington and the Portland/Vancouver area. He furthered his education by receiving his Masters in Nursing, with an emphasis in Family Medicine, from Washington State University in 2001. Craig Schultz has worked for Kaiser Permanente in Internal Medicine and Urgent Care, and as a same-day clinician at the Vancouver Clinic. He joined Knott Street Dermatology in 2007, and has had extensive training and mentorship by Dr. Eric Hanson.

Craig Schultz is a board certified member of the American Academy of Nurse Practitioners, a Certified Dermatology Nurse Practitioner, as well as an affiliate of the Dermatology Nurses Association.

Craig is an avid bicycle commuter, and enjoys spending his free time with his wife Michelle and their two children.

Docotr of Dermatology in Portland Dr. Krista Larson


Dr. Krista N. Larson is a Board Certified general, surgical and cosmetic dermatologist. Originally from Miami, FL, she earned her undergraduate degree from the University of Florida with a double major in biology and neurobiological sciences. She received her medical degree in 2016 from the University of Virginia School of Medicine in Charlottesville, VA. She then completed her internal medicine internship at the University of Florida Shands Hospital in Gainesville, FL. Dr. Larson completed her dermatology residency at West Virginia University in Morgantown, WV, where she was named Chief Resident in 2019.

Dr Larson is actively affiliated with the American Academy of Dermatology (AAD), the American Society of Dermatologic Surgery (ASDS) and the American Society of Mohs Surgeons (ASMS). She is a certified translator in Spanish. When not seeing patients, Dr. Larson enjoys traveling, yoga, hiking, and spending time with her family and friends.



Our clinical staff consists of Nurses and Certified Medical Assistants whose main role is to ensure optimal patient care and smooth coordination between patients and providers. All of our Clinical Staff receive the highest training and certification and are well equipped to assist you.


Our administrative staff perform a variety of duties such as front desk reception, scheduling, insurance verification, bookkeeping and other tasks necessary for great patient care.


At Knott Street Dermatology, our Aesthetic department is lead by an incredible team of professionals. Their goal is to provide you with a comfortable atmosphere for all of your aesthetic needs helping you achieve a natural, youthful appearance.

Mohs micrographic surgery staff


Mohs micrographic surgery is a specialized, highly effective technique for the removal of skin cancer. The procedure was developed in the 1930s by Dr. Frederic Mohs and is now practiced throughout the world. Unlike other skin cancer treatments, Mohs surgery allows tissue to be removed in stages and examined under the microscope to facilitate clearance of abnormal cells while you wait. Due to the methodical manner in which the tissue is extracted and examined, Mohs surgery is recognized as the skin cancer treatment with the highest reported cure rate.

Contact Us

If you have any questions, concerns, or would like to schedule an appointment please let us know. 

  • This field is for validation purposes and should be left unchanged.