Skip to main content
Dr. Gerrish Explains

Understand it first. Then decide.

A physician-authored library from Scott Gerrish, DO, explaining how technologies work, why skin and the body change, and how to think clearly about treatment options. No hype or sales pressure. Just useful medical context.

Injectables

Injectables: What to Expect Before, During & After Treatment

A practical guide to injectable assessment, the treatment-day sequence, common temporary effects, aftercare, safety, and the differences among injectable products.

6 min read
Laser Technology

How Lasers Actually Interact With Your Skin

Laser results are shaped by more than a device name. Wavelength, pulse duration, energy, spot size, cooling, and treatment depth determine what happens in the skin.

6 min read
Skin Aging

Why Skin Ages: The Processes Beneath the Surface

Visible aging is not one process. Changes in the epidermis, pigment, collagen, fat, muscle, ligaments, and bone combine over time, which is why one treatment rarely addresses everything.

6 min read
Collagen

Collagen: The Honest Story

Almost every aesthetic treatment claims to stimulate collagen. The more useful questions are what type of tissue response is created, where it occurs, how it remodels, and what the evidence actually supports.

6 min read
Pigmentation

Understanding Pigmentation: Sun Spots, Melasma, and Why They Differ

Brown is a color, not a diagnosis. Sun spots, melasma, post-inflammatory pigment, and other lesions can look similar while requiring very different treatment strategies.

5 min read
Body Contouring

Body Contouring: What Technology Can and Cannot Do

Body contouring can change a localized contour, but it is not weight loss, metabolic treatment, muscle training, or surgery. The first task is identifying which problem is actually present.

5 min read
Injectables

Injectables: Why Less Is Usually More

Natural injectable treatment is not about using the smallest possible amount. It is about using the right product, dose, plane, and sequence to restore balance without changing identity.

5 min read
Hormones

Hormones and Aging: Why How You Feel Is Part of How You Look

Hormonal changes can affect sleep, energy, temperature regulation, sexual health, bone, muscle, body composition, and skin. Evaluation matters because symptoms and laboratory values must be interpreted together.

7 min read
Longevity

Longevity: Aging Well Is About More Than Appearance

The meaningful goal is not simply a longer lifespan. It is more years with strength, cognition, independence, purpose, and the confidence to participate fully in life.

6 min read
Safety & Suitability

Safety and Suitability: What We Review Before Treatment

Every treatment has considerations that depend on your health, anatomy, skin type, medications, and goals. This guide explains how we think about safety and suitability across the categories of care we offer, and what we review with you before recommending anything.

10 min read
Neuromodulation

TMS and Cognitive Decline: What the Research Shows and What Remains Uncertain

A balanced review of randomized, sham-controlled TMS research in mild cognitive impairment and Alzheimer's disease, including positive, neutral, and regulatory evidence.

9 min read
Neuromodulation

TMS and Sleep: What the Research Shows and What Remains Uncertain

A balanced review of randomized and sham-controlled TMS studies for insomnia and sleep, including subjective outcomes, objective sleep measures, durability, and limitations.

8 min read