Hyperhidrosis is a condition that causes the sweat glands to enlarge and cause excessive sweating. It can occur in sweat glands all over the body, including the hands and feet, but it is most common in the underarm area. Excessive underarm sweating or axillary hyperhidrosis can take a toll on one’s self-esteem and affect their quality of life. There is no cure yet for primary axillary hyperhidrosis but the good news is it’s possible to reduce sweating and treat hyperhidrosis with a number of treatment options to choose from. More importantly, excessive sweating is a medical condition so hyperhidrosis treatments must be performed by a professional.  

Female armpit injected for hyperhidrosis treatment | Knott Street Dermatology | Skin Care Center | Portland Oregon

A prescription called Drysol can be an effective remedy for treating excessive sweating. Drysol is a topical antiperspirant with 20% aluminum chloride that works by affecting the cells that produce sweat, causing the enlarged sweat glands to shrink down to their normal size. Injections of Botox (a purified form of botulinum toxin) are also an effective treatment for hyperhidrosis but do require continued maintenance. Botox is a popular treatment for reducing fine lines and wrinkles, but doctors can also use botox to treat hyperhidrosis.

The series of injections needs to be repeated about 2 to 3 times a year and is typically not covered by insurance. When Botox is injected directly into muscles surrounding the enlarged sweat glands in the axillary areas (armpits), it temporarily inhibits the sweat glands from producing excess sweat. Response is usually seen within 7 to 10 days after injections, and several sessions may be needed to complete the series and achieve the best results. You may go home immediately after your botox for excessive sweating treatment but you should avoid exercise or have hot baths or showers for the rest of the day. Your aesthetician may recommend follow up treatments to touch up any missed areas and to check for side effects. 

With Botox, you can stop excessive sweating in your underarms. Schedule a consultation with our doctors at Knott Street Dermatology in Portland, Oregon today and start your journey to self-confidence.



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.


Peral Sanchez LE,CAE

Perla is a proud Hispanic who is bilingual in Spanish. She graduated from Spectrum Advanced Aesthetic Institute. Perla grew up in Compton, CA before moving to Oregon and finding her passion for the aesthetic industry. She has a love for skincare and all things ingredients. She’s devoted to continuing her education and has a desire to achieve her clients needs and concerns. She wants “self-care to be an everyday spa like experience.” In her spare time she enjoys hang with her German Shepard (Sable) and exploring Oregon with her Husband.

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!

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