By Board Certified Dermatologist Whitney Vinson, MD

If you grew up pouring hydrogen peroxide on every cut or scrape, you’re not alone.

For many of us, that bubbling reaction felt like proof it was “working”—cleaning the wound and killing bacteria.

But the science behind hydrogen peroxide is more nuanced than that.

What Does Hydrogen Peroxide Actually Do on a Wound?

When hydrogen peroxide touches your skin, it reacts with an enzyme called catalase, which is naturally present in healthy tissue.

This reaction breaks hydrogen peroxide down into water and oxygen, which creates the bubbling effect you see.

Here’s the key point:

• That bubbling is not hydrogen peroxide killing bacteria
•  It’s a reaction with your own healthy cells

Does Hydrogen Peroxide Kill Bacteria?

Hydrogen peroxide can have antibacterial (bacteriostatic) properties—but only under specific conditions.

To be effective, it would need:

• a high enough concentration

• sustained contact over time

In real-life wound care, that doesn’t happen.

Your body breaks hydrogen peroxide down so quickly that it:

• doesn’t stay in the wound long enough

• doesn’t provide meaningful antibacterial benefit

Why Dermatologists Don’t Recommend It for Routine Wound Care

In addition to being ineffective for cleaning wounds, hydrogen peroxide can be cytotoxic, meaning it can damage healthy cells.

Those healthy cells are exactly what your body needs to:

• repair tissue

• rebuild skin

• heal the wound

So while it may feel like you’re helping, it can actually slow the healing process.

When Is Hydrogen Peroxide Used in Dermatology?

There are specific situations where hydrogen peroxide is used in a medical setting.

For example:

• Wound debridement (helping lift crust or debris)

• Situations where controlled use can assist in removing buildup

In these cases, it’s used intentionally and carefully—not as routine at-home wound care.

So What Should You Use Instead?

For most everyday cuts and scrapes, simple is best:

1. Clean the wound with water
Studies have shown that tap water is just as effective as sterile saline for cleaning wounds.

2. Keep it moist
Apply a thin layer of petroleum jelly (like Vaseline)

3. Cover it
Use a bandage to protect the area and support healing

Do Wounds Need to “Dry Out”?

This is another common myth.

Wounds actually heal better in a moist environment.

Letting a wound dry out can:

• lead to scab formation

• slow healing

• increase irritation

Keeping it moist and covered helps support more efficient healing.

The Bottom Line

Hydrogen peroxide isn’t “wrong”—but for most wounds, it’s unnecessary and less effective than simpler methods.

In wound care, more isn’t always better.

Often, the best approach is the simplest one:
water, moisture, and protection.

About Dr. Vinson

Dr. Vinson is a board-certified dermatologist, Idaho native, and mother of four. She sees patients at Ada West Dermatology’s Barber Station clinic in Southeast Boise.

She also shares evidence-based, research-backed insights on parenting and health through her platform @DataDrivenParents.