Knott Street Dermatology offers a wide array of dermatological treatments for patients with various skin conditions. One of these is Excimer (Xtrac®), which can address psoriasis and vitiligo.

Psoriasis is a skin disease causing red, itchy scaly patches, usually on the knees, elbows, torso and scalp. Vitiligo is a condition where the skin loses pigment, resulting in discolored patches in areas of the body.

Excimer (Xtrac®) in Portland

Excimer (Xtrac®) is a form of laser treatment that utilizes ultraviolet (UVB) light to treat various skin diseases, including psoriasis and vitiligo. Exposure to beneficial high energy UV light is applied to the affected areas for varying lengths of time, while the UV rays that cause burning are eliminated. Total number of treatments and clearing time will vary by patient and condition. Though not a cure, this treatment can effectively control and improve these conditions. Since its invention in 1970, patients have used this treatment successfully and are often able to maintain clearance of improved skin for extended periods of time.

To learn more about treatments for skin conditions, contact Knott Street Dermatology for immediate consultation, or send in your queries through our website. Reach out to us today for a scheduled appointment to learn more. Knott Street Dermatology treats patients in and around Portland including Happy Valley, Clackamas, Gladstone, Damascus, Gresham, and Fairview.



Checkout our before and after gallery where we feature a few our recent patients. 






Our team is made up of experienced professionals
excited to help and provide personalized care just for you.


Alicia McCarthy, ND

Dr. Alicia McCarthy earned her Bachelor of Science in Kinesiology degree from California State University of Fullerton in 2008 and her Naturopathic Medical degree in 2017 from National University of Natural Medicine in Portland, OR. The twelve years Dr. McCarthy spent working in emergency medicine as an EMT set the foundation for the provider she is today. She now specializes in aesthetic medicine, dedicating her continuing education and practice to staying current on the latest techniques and products. Dr. McCarthy believes in aging gracefully. She takes the time to sit down with each patient and find out what this means for them.

Prior to joining Knott Street Dermatology, Dr. McCarthy had her own practice in Lake Oswego focused on aesthetic medicine, hormone balancing, thyroid conditions, and IV medicine.

Originally from Southern California, Dr. McCarthy has lived in Portland for the last eleven years. When she is not working Dr. McCarthy stays busy with her two young kids, husky pup, and husband. They enjoy spending time outside, camping, swimming, and playing at the park.

Rachel Almada advanced Aesthetician from KNOTT STREET DERMATOLOGY

Rachel Almada LE,CAE

Rachael graduated from the Aesthetics Institute in 2020 and recently acquired a Bachelor of Arts from Portland State University. Coming from a dermatology background, Rachael has a passion for skin health and sun protection. Her favorite part about being an Advanced Aesthetician is helping patients reach their skin goals and watching their confidence build because of it. She understands that everyone’s skin requires its own unique approach whether it’s a treatment plan or a skincare regimen.

When she is out of the office, Rachael enjoys traveling, trying new food, making art, and doing pretty much anything outdoors – especially if it includes her Doberman-mix pup, Rubio!

Contact Us

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



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