Understanding Acne: Types, Causes, and Treatment Approaches

Acne isn’t one condition — it’s a category. The small blackhead on your nose, the painful cyst on your chin, and the scattered whiteheads on your forehead are all “acne,” but they have different causes, different severities, and respond to different treatments.

Understanding what type of acne you’re dealing with is the first step toward effective management.

How Acne Forms

All acne starts with the same basic process:

1. Excess sebum production — sebaceous glands produce too much oil
2. Abnormal keratinisation — dead skin cells don’t shed normally and accumulate in the pore
3. Bacterial involvement — Cutibacterium acnes (formerly Propionibacterium acnes) proliferates
4. Inflammation — immune response creates redness, swelling, and pain

Different types of acne involve these factors to different degrees.

Blackheads (Open Comedones)

What they are: Pores clogged with sebum and dead skin cells, with an opening to the surface.

Why they’re black: The material oxidises when exposed to air, turning dark. It’s not dirt.

Where they appear: Commonly on the nose, chin, and forehead.

Treatment approach:

• Salicylic acid (oil-soluble, penetrates pores)
• Retinoids (normalise cell turnover)
• Regular gentle exfoliation
• Extraction by professionals if needed

Whiteheads (Closed Comedones)

What they are: Pores clogged with sebum and dead skin cells, but with a closed surface.

Appearance: Small, flesh-coloured or white bumps. Not inflamed.

Where they appear: Anywhere on the face; common on forehead and cheeks.

Treatment approach:

• Retinoids (most effective for closed comedones)
• Salicylic acid
• AHAs (help with surface cell turnover)
• Time and consistency

Closed comedones are stubborn. They can take weeks to months to clear.

Papules

What they are: Small, raised, red bumps. The comedone has become inflamed.

Appearance: Red, tender, no visible pus.

Cause: Bacterial proliferation and immune response.

Treatment approach:

• Benzoyl peroxide (kills bacteria)
• Salicylic acid
• Niacinamide (anti-inflammatory)
• Topical antibiotics (if needed)
• Retinoids (prevention)

Pustules

What they are: Papules that have developed a white or yellow centre — visible pus.

Appearance: Red base with white/yellow top. The classic “pimple.”

Important: Resist squeezing. Improper extraction spreads bacteria and causes scarring.

Treatment approach:

• Same as papules
• Spot treatments with benzoyl peroxide
• Sulfur-based treatments
• Professional extraction if necessary

Nodules

What they are: Large, hard, painful lumps deep within the skin.

Appearance: Large (>5mm), firm, painful, no visible head.

Why they’re serious: High risk of scarring. The inflammation is deep.

Treatment approach:

• Often requires prescription treatment
• Topical retinoids (prevention)
• Oral antibiotics may be needed
• Isotretinoin for severe cases
• Cortisone injections for individual lesions
• Professional management recommended

Cysts

What they are: Large, pus-filled lesions deep within the skin.

Appearance: Soft, painful, large, sometimes with multiple heads.

Why they’re serious: Highest risk of scarring. Very painful.

Treatment approach:

• Almost always requires medical intervention
• Isotretinoin is often indicated
• Cortisone injections
• Incision and drainage by professionals
• Do not attempt home treatment

Acne Grades

Dermatologists often grade acne severity:

Grade I (Mild): Mostly comedones, few papules.

Grade II (Moderate): Mix of comedones and inflammatory lesions.

Grade III (Moderately Severe): Numerous inflammatory lesions, some nodules.

Grade IV (Severe): Many nodules and cysts, widespread inflammation.

Treatment intensity should match severity. Over-treating mild acne causes unnecessary irritation; under-treating severe acne risks permanent scarring.

Hormonal Acne

Pattern: Typically around the chin, jawline, and lower cheeks.

Timing: Flares with menstrual cycle, often in the week before menstruation.

Characteristics: Often deeper, cystic lesions. May not respond well to typical topical treatments.

Treatment approach:

• Standard topical treatments may help but aren’t sufficient alone
• Hormonal treatments (birth control, spironolactone) often needed
• Medical evaluation recommended

Fungal Acne (Pityrosporum Folliculitis)

What it is: Not true acne — it’s a yeast infection of hair follicles.

Appearance: Uniform small bumps, often itchy, commonly on forehead, chest, back.

Why it matters: Doesn’t respond to acne treatments; may worsen with them.

Treatment approach:

• Antifungal treatments (ketoconazole, etc.)
• Avoid heavy oils and occlusive products
• Correct diagnosis is essential

Acne Mechanica

Cause: Friction, pressure, or heat.

Common triggers: Helmets, masks, tight clothing, sports equipment.

Treatment: Address the cause, gentle cleansing, standard acne treatments.

Acne Cosmetica

Cause: Cosmetic products clogging pores.

Solution: Identify and eliminate the offending product. Switch to non-comedogenic formulations.

For Comedonal Acne (Blackheads/Whiteheads)

First choice: Retinoids — normalise keratinisation, prevent new comedones.

Supporting: Salicylic acid — penetrates and clears pores.

Additional: AHAs — surface exfoliation.

For Inflammatory Acne

Antibacterial: Benzoyl peroxide — kills C. acnes without resistance.

Anti-inflammatory: Niacinamide — reduces redness and inflammation.

Cell turnover: Retinoids — prevent new lesions.

Bacterial control: Topical antibiotics (with benzoyl peroxide to prevent resistance).

For Severe Acne

Medical intervention needed. Options include:

• Oral antibiotics
• Hormonal treatments
• Isotretinoin
• Professional procedures

Basic Framework

Cleanse: Gentle, non-stripping cleanser. Over-cleansing worsens acne.

Treat: Active ingredients appropriate to your acne type.

Moisturise: Yes, even oily, acne-prone skin needs moisture. Dehydrated skin produces more oil.

Protect: Sunscreen daily. Many acne treatments increase sun sensitivity.

Sample Routine (Mild-Moderate Acne)

Morning:

• Gentle cleanser
• Niacinamide serum
• Lightweight moisturiser
• Sunscreen

Evening:

• Gentle cleanser
• Treatment (salicylic acid or benzoyl peroxide)
• Moisturiser

2-3 times weekly: Retinoid (building tolerance)

What Not to Do

• Over-cleanse (damages barrier, increases inflammation)
• Use all actives at once (irritation without benefit)
• Skip moisturiser (dehydration worsens oil production)
• Pick or squeeze (spreads bacteria, causes scarring)
• Expect overnight results (treatments take 6-12 weeks)

When to See a Professional

Consider professional help if:

• You have nodules or cysts
• Scarring is occurring
• Over-the-counter treatments haven’t worked after 3 months
• Acne is affecting your mental health
• You suspect hormonal acne
• Acne appeared suddenly in adulthood

Dermatologists have access to treatments not available over the counter — prescription retinoids, antibiotics, hormonal treatments, and isotretinoin.

Scarring Prevention

The best scar treatment is prevention:

• Treat acne early and appropriately
• Don’t pick or squeeze
• Manage inflammation quickly
• Seek treatment for severe acne before scarring occurs

Once scars form, treatment options include chemical peels, microneedling, laser treatments, and dermal fillers — all requiring professional intervention.

Diet

Evidence is mixed, but some research suggests:

• High-glycemic foods may worsen acne
• Dairy (especially skim milk) may contribute for some people
• Elimination trials may help identify personal triggers

Stress

Stress hormones can trigger breakouts. Stress management may help, though it’s not a standalone treatment.

Sleep

Poor sleep affects hormones and inflammation. Good sleep hygiene supports skin health.

The Bottom Line

Acne treatment isn’t one-size-fits-all. Understanding whether you’re dealing with comedonal, inflammatory, or cystic acne determines the right approach.

Mild acne responds to over-the-counter treatments with patience. Moderate acne may need prescription support. Severe acne requires medical intervention to prevent scarring.

Whatever your type, consistency matters more than intensity. Gentle, sustained treatment outperforms aggressive approaches that damage the barrier and increase inflammation.