Acne Is Not Dirty Skin: A Dermatologist Explains What Actually Causes Acne (And How to Treat It)

Despite being one of the most common skin conditions in the world—affecting up to 50 million Americans every year—acne remains widely misunderstood.

And that misunderstanding isn’t harmless. It prevents people from finding effective treatment, fuels frustration, and makes patients vulnerable to myths and “miracle” products that overpromise and underdeliver.

At Rejuvenation Dermatology – Calgary North, we believe that understanding acne is the first step toward treating it properly.

In this article, we’ll cover:

• How acne actually develops
• The different types of acne
• What you can safely do at home
• Common myths that worsen acne
• How to treat acne marks (PIE and PIH)
• The difference between marks and true acne scars

If you understand the mechanism, you’ll understand the treatment.

How Acne Actually Happens

Acne begins in a pore — more specifically, in the pilosebaceous unit, which consists of a hair follicle attached to an oil gland.

There are four major steps involved in acne development:

1. Increased Oil Production

Hormones—especially androgens—stimulate oil glands. Increased oil alone does not automatically cause acne. If oil were the only issue, you would simply have oily skin. However, excess oil creates the environment where acne can develop.

2. Abnormal Shedding and Pore Blockage

The cells lining the pore (keratinocytes) begin to shed abnormally. Instead of shedding cleanly, they become sticky and clog the opening of the follicle.

When you combine:

• Increased oil
• A blocked pore

The pore fills with sebaceous material.

Clinically, this appears as:

• Whiteheads (closed comedones)
• Blackheads (open comedones)

Blackheads are not dirt. They are oxidized oil exposed to air.

If acne stops at this stage, it is called comedonal acne.

3. Bacterial Overgrowth

Everyone naturally has Cutibacterium acnes bacteria on their skin. Acne is not caused by poor hygiene.

However, when a pore is clogged and oxygen levels drop, the environment becomes ideal for bacterial overgrowth. As bacterial levels increase, the immune system reacts.

4. Inflammation

Inflammation transforms a clogged pore into:

• Red bumps (papules)
• Pustules
• Nodules
• Cysts

The greater the inflammation, the higher the risk of scarring.

This is why acne is not a hygiene issue. None of the steps above involve dirt. Acne is a combination of oil production, pore blockage, bacterial proliferation, and inflammation.

Types of Acne (And Why Diagnosis Matters)

For treatment purposes, acne is often classified by morphology—what the lesions look like.

Comedonal Acne

• Mostly blackheads and whiteheads
• Texture without much redness
• Treatment focus: increasing epidermal turnover

Inflammatory Acne

• Red bumps and pustules
• Treatment focus: turnover plus anti-inflammatory and antibacterial therapy

Nodulocystic Acne

• Large, deep, painful lesions
• Higher risk of scarring
• Often requires prescription medication

There are also acne patterns based on cause, including hormonal acne, acne mechanica (friction-related), and acne caused by hair products. Proper evaluation helps determine the most effective treatment plan.

If you are unsure what type of acne you have, consider booking an appointment at our clinic:

👉 Book a Consultation – Calgary North

How to Start Treating Acne at Home

If acne is painful, scarring, or persistent, professional evaluation is recommended. Early treatment prevents long-term damage.

That said, here is a rational foundation for home care.

Step 1: Build a Simple Routine

Before adding actives, stabilize your skin barrier with:

• Gentle cleanser
• Non-comedogenic moisturizer
• Daily sunscreen

Any product can worsen acne in the wrong individual. Start simple.

For Comedonal Acne

Your goal is to normalize cell turnover.

Retinoids (retinol, retinal, or prescription retinoic acid) increase epidermal turnover and reduce pore blockage.

Start:

• 2–3 nights per week
• Increase slowly as tolerated
• Apply after cleansing, before moisturizer

Once tolerated, consider adding salicylic acid on alternate nights. Do not exceed 2–3 nights weekly initially.

For Inflammatory Acne

Continue a retinoid.

Add:

• Benzoyl peroxide, ideally in a cleanser form

This reduces bacterial load and inflammation.

A Multi-Tasking Ingredient: Azelaic Acid

Azelaic acid is:

• Anti-inflammatory
• Antibacterial
• A tyrosinase inhibitor (helps pigmentation)
• Safe for teens
• Safe during pregnancy
• Safe for all skin tones

It can be added once daily and increased gradually.

The Golden Rule: Do Not Pick

Picking increases:

• Inflammation
• Infection risk
• Permanent scarring

Professional extraction in a sterile clinical environment is not equivalent to squeezing at home.

Acne Myths That Worsen Skin

Myth 1: Acne Is Dirty Skin

Overwashing damages the skin barrier and increases inflammation.

Myth 2: More Actives = Faster Results

Stacking multiple exfoliants and treatments often causes irritation acne.

Myth 3: Popping Helps

It increases scarring risk.

Myth 4: DIY Hacks Work

Toothpaste, lemon juice, and alcohol are irritants.

Myth 5: Burning Means It’s Working

Burning means irritation—not efficacy.

Acne Marks: PIE vs PIH

Many patients refer to these as “acne scars,” but they are not true scars. They are color changes.

PIE (Post-Inflammatory Erythema)

Red or pink marks caused by inflammation and dilated blood vessels.

PIH (Post-Inflammatory Hyperpigmentation)

Brown marks left behind after inflammation, more common in medium to deeper skin tones.

What Helps:

• Daily sunscreen (essential)
• Azelaic acid
• Retinoids
• Vitamin C
• Tranexamic acid

If marks persist, in-office laser treatments may help:

• Vascular lasers for red marks
• Pigment-targeting lasers for brown marks

Learn more about laser treatments here:
👉 Laser & Energy-Based Treatments

Laser selection must be customized based on skin tone and mark type.

True Acne Scars

Scars are structural changes in texture.

There are two main categories:

Atrophic (Indented) Scars

• Ice pick scars
• Boxcar scars
• Rolling scars

Treatment options may include:

• TCA CROSS
• Punch excision
• Fractional laser resurfacing
• Microneedling
• Subcision

Hypertrophic / Keloid Scars

Raised scars requiring combinations of:

• Injections
• Laser
• Occasionally surgery

There is no reliable at-home product that erases established acne scars.

For scar consultation:

👉 Book a Scar Assessment

The Most Important Thing: Time and Consistency

There is no 7-day acne transformation.

Effective acne treatment involves:

• Barrier support
• Targeted active ingredients
• Sometimes prescription medications
• Sometimes in-office procedures
• Consistency over weeks to months

Acne is treatable—but it requires patience and the right plan.

If you’re struggling with acne in Calgary, we’re here to help.