About ONYX

Welcome to ONYX Wellness & Aesthetics, a boutique medical aesthetics and wellness practice in Nashville, Tennessee, where personalized care, advanced treatments, and natural-looking results come together.

We believe looking your best should still feel like you. Our approach goes beyond a single treatment or concern by considering the full picture—from facial balance and skin health to confidence and overall wellness. Whether you are interested in injectables, advanced skin rejuvenation, laser treatments, hair restoration, or support through medical weight management and carefully selected weight loss supplements, your experience begins with understanding your individual goals.

Founded by Ericka Marshall, FNP-BC, ONYX was built on the belief that aesthetic care should feel thoughtful, honest, and personal. Our team combines medical expertise with an eye for balance and natural enhancement, creating individualized treatment plans designed to refine, refresh, and restore—never to make you look like someone else.

There are no one-size-fits-all plans here. We take the time to listen, educate, and recommend treatments that make sense for you, your lifestyle, and where you want to go. The goal is simple: results that look refreshed, balanced, and authentically yours.

Whether you are beginning your aesthetic journey, looking to improve the health and appearance of your skin, or taking a more intentional approach to your overall wellness, we are here to help you feel confident every step of the way.

Discover a more personalized approach to aesthetics, skin health, and wellness at ONYX.

ONYX Special Services

beauty, wellness, and innovation

Microneedling

Weight loss

Lasers

Injectables

meaningful impact

ONYX

Owner and Founder

As a dedicated board certified – Nurse Practitioner, Ericka Marshall (Exercise Science – UT-Knoxville, BS Nursing – East Tennessee State University, MS Nursing – Lincoln Memorial University) has always been driven by a desire to make a meaningful impact on people’s lives.

After years of working with various companies, she became increasingly aware of the lack of quality in the healthcare and aesthetic industry. With a strong belief that quality should never be compromised, she set out to create a personalized, quality-driven approach dedicated to prioritizing patients above all else which led her to establish ONYX Wellness & Aesthetics.

Ericka believes that aesthetics and longevity medicine work synergistically to enhance inner vitality allowing one to feel confident and vibrant at any age. By integrating advanced aesthetic treatments with evidence-based longevity practices, she helps clients unlock their full potential and embrace their unique beauty.

"I cannot say enough great things about Ericka! She takes her time with each client & genuinely listens to our concerns & needs. She is extremely knowledgeable and I trust her recommendations. She's a pro with PDO threads & my go-to for Botox & microneedling. She goes above & beyond with each client and I look forward to every appointment that I have with her. I highly recommend, Ericka!"

D.S.F.

"I have been going to ONYX WELLNESS for 4 years now and it has been always such a welcoming, warm and comfortable experience. Ericka is amazing and she has recruited a fantastic team behind her. I always feel like I'm walking in to see old friends when I go to my appointments!"

Becca White

"I can’t say enough good things about Ericka and the team! I’ve had both dermaplaning and Botox treatments here, and the experience has been amazing from start to finish. Everyone is so knowledgeable, welcoming, and the skincare product selection is unmatched! Onyx client for life!"

The Libby O Show

"I recently started going to Onyx to see Tessa. During my visit, Ericka came in to say hi and introduce herself. All of the staff that I interacted with were so kind and welcoming. The location is great and has plenty of free parking. Highly recommend Onyx to help you curate an aesthetics plan that fits your needs and goals."

Kelsey Eva