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Medical & Surgical Procedures

Our experienced providers are committed to providing real solutions for optimal skin health. At Knott Street Dermatology, we offer comprehensive medical and surgical care to address all skin conditions. Among other treatments for skin cancer, we offer Mohs micrographic surgery performed by board-certified physicians. We also offer laser and light treatments, in addition to skin patch testing for allergic contact dermatitis. While predominantly a medical/surgical practice, Knott Street Dermatology also offers medical aesthetic treatments. (See the cosmetic section for more details.) Our providers treat all benign and malignant skin growths and tumors, along with rashes and other skin, hair, and nail disorders using the latest therapies.

Learn more about the medical & surgical procedures offered at Knott Street Dermatology by following the links below:
  • Mohs micrographic surgery
  • Skin cancer treatment / procedural dermatology
  • Photodynamic therapy (PDT)
  • Acne treatment
  • Narrowband UVB
  • Excimer laser (XTRAC®)
  • Patch testing

Tap the links below to learn more about our medical and surgical procedures below. (Tap again to close.)

► Mohs Micrographic Surgery
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.

Additional information about Mohs surgery can be found on the American Society for Mohs Surgery website at

Should your provider indicate Mohs micrographic surgery for your condition, please click on the link to explain what to expect before, during, and after treatment.

► Skin Cancer Treatment/Procedural Dermatology
We offer a variety of treatment options for skin cancers including Mohs micrographic surgery, excisional surgery, topical chemotherapy, cryotherapy, as well as oncology referral when warranted. Our goal is to select the best treatment option for individual skin cancer situations, while educating patients on all the reasonable choices.

Should your provider indicate Mohs micrographic surgery, excisional surgery, topical chemotherapy, or cryotherapy as a treatment for your condition, please click on the links to explain what to expect before, during, and after treatment.

► Photodynamic Therapy (PDT)
 A picture of a patient receiving Photodynamic Therapy treatment.Photodynamic Therapy (PDT) is a procedure used to treat actinic keratoses (precancerous lesions), certain types of skin cancer, and acne. The purpose of PDT is to create a chemical reaction that destroys only abnormal cells, while leaving normal cells intact. The treatment consists of application of a sensitizing agent (aminolevulinic acid), which is allowed to absorb for approximately one to two hours, followed by exposure to intense light for 15 minutes. After a short healing time period, new skin cells are allowed to turn over and replace the problem cells.

  A picture of a patient preparing to receive Photodynamic Therapy treatment. Should your provider indicate Photodynamic Therapy (PDT) for your condition, please click on the link for a PDT instruction packet.

► Acne Treatment
 A picture of a doctor explaining an acne treatment to a patient. Acne is a common skin condition that affects people of all age groups. Knott Street Dermatology offers many anti-acne strategies, including traditional oral and topical antibiotics, hormonal therapies, and isotretinoin managed by the iPledge program.

Additionally, the Photodynamic Therapy (PDT) device utilizes a specific blue or red light that can also target certain types of acne. In some cases, a provider may recommend that a series of PDT be combined with a series of chemical peels for optimal results.

Should your provider indicate Photodynamic Therapy (PDT) for your acne condition, please click on the links for instructions and consent forms.

► Narrowband UVB
 A Knott Street Dermatology nurse explaining a Narrowband UVB treatment to a patient. Ultraviolet B (UVB) light is found in natural sunlight, along with other types of radiation. It penetrates the skin and slows the rapid growth of skin cells associated with certain skin disorders. When isolated and regulated, this modality is an effective treatment for psoriasis, atopic dermatitis (eczema), vitiligo, and other chronic skin conditions. Narrowband UVB treatments are not a permanent cure, but can effectively control or improve your condition, sometimes over extended periods of time. Our NE Portland office houses a full-length Narrowband UVB booth for customized light treatment plans.

 A picture of the Narrowband UVB treatment machine.Should your provider indicate Narrowband UVB as a treatment for your condition, please click on the link for instructions and a consent form.

► Excimer Laser (Xtrac®)
An alternative modality of treatment for psoriasis and vitiligo is the excimer laser which delivers a carefully focused beam of light guided to reach a specific area. This technology concentrates light focally on psoriasis plaques or areas of depigmentation (vitiligo), allowing the operator to utilize the highest doses of light necessary for rapid clearing while minimizing exposure to healthy skin. During treatment, some patients feel warmth depending on the dose setting; however, the heat is a non-burning temperature. The feeling of heat dissipates after the laser completes the treatment in each area.

Excimer laser is particularly effective for treating difficult psoriasis areas, such as elbows, knees, and scalp. Individual results will vary depending on the body surface affected. Most patients experience significant improvement in as few as 6 to 10 treatments, and clearance in 10 to 20 sessions depending on the severity. Average remission times for psoriasis have been reported for 3.5 to 6 months.

Excimer laser treatments can minimize, and in many cases eliminate, vitiligo depigmented patches. Relatively large, discrete areas can be treated in just 5 to 10 minutes. Clinical analysis of vitiligo showed that 71.5% of facial spots, and 60% of neck and scalp areas treated, achieved 75% or greater repigmentation.

Should your provider indicate excimer laser (Xtrac®) as a treatment for your condition, please click on the link for a consent form.

► Patch Testing
A picture of a dermatology patient in portland Oregon undergoing a patch test up close for demonstration. Allergic contact dermatitis can be the underlying cause for many chronic rashes. Our office offers patch testing, which differs from the "pin prick" testing that most people are familiar with for identifying environmental or food allergies. Our technique involves application of patches to the entire back containing products/chemicals suspected to be the cause of your dermatitis. The patches contain substances from the North American Contact Dermatitis Society's core allergen list and can be found in jewelry, skin care products, soaps, cosmetics, fragrances, and clothing. Patients are first assessed by one of our providers to determine if patch testing is appropriate, and then insurance authorization is obtained to determine out-of-pocket expenses for the testing.

 A nurse showing how a patch test is done to a different patient. Additional information about patch testing can be found on the American Contact Dermatitis Society (ACDS) website at

Should your provider indicate patch testing for your condition, please click on the link for an informational packet describing what the process entails.

Main Office
301 NE Knott St
Portland, OR 97212

Milwaukie Office
10330 SE 32nd Ave, Ste 330
Milwaukie, OR 97222


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Knott Street Dermatology, 301 NE Knott St, Portland, OR, 97212-3014 - Associated Words: Dermatologist Portland OR / Same Day Dermatology Clinic Portland OR / Dermatologist Portland OR / (503) 345-5512 Portland
(971) 361-9731 Milwaukie / / 10/20/2017