Acne is a chronic inflammatory skin disease affecting roughly 85% of people at some point in life — and it is not limited to adolescence. In a significant proportion of adult women it persists past 25 or returns later. When poorly managed, the scars and marks left behind outlast the acne itself by years. The goal of treatment is therefore not merely clearing current lesions but preventing new lesions and scar formation.
How Acne Forms: Four Core Mechanisms
Acne is a disease of the pilosebaceous (hair follicle–oil gland) unit and develops through four mechanisms acting together. The first is increased sebum production: androgens enlarge the sebaceous glands and drive more sebum output. The second is follicular hyperkeratinisation — the cells lining the duct proliferate excessively and become sticky, blocking the opening. This is the birth of the comedone (blackhead/whitehead).
The third is increased colonisation by Cutibacterium acnes in the now blocked, oxygen-poor duct. The fourth — and arguably the most important — is inflammation: bacterial products and free fatty acids activate innate immunity, the duct wall ruptures and its contents spill into the dermis. Papules, pustules and nodules are the clinical expression of this inflammatory response. Current research shows inflammation actually begins before the comedone forms, which explains why anti-inflammatory treatment is effective even at an early stage.
Types and Severity
Comedonal acne: predominantly blackheads and whiteheads with minimal inflammation. Responds very well to retinoid-based treatment.
Papulopustular acne: dominated by red bumps (papules) and inflamed heads (pustules). Graded mild, moderate or severe.
Nodulocystic acne: deep, painful nodules and cysts; the form with the highest scarring risk, usually requiring systemic treatment.
Hormonal acne: in women, deep and stubborn lesions along the jawline, under the chin and on the neck, fluctuating with the menstrual cycle. Should be assessed for polycystic ovary syndrome (PCOS), insulin resistance and androgen excess.
Differential diagnosis: rosacea (papulopustular form), perioral dermatitis, folliculitis and steroid acne are frequently mistaken for acne — their treatments differ entirely, so correct distinction is critical.
Triggers: What Actually Makes a Difference?
Diet: a high-glycaemic-index diet (sugar, white flour, processed carbohydrate) and skimmed dairy in particular raise insulin and IGF-1, amplifying androgenic stimulation and sebum output. A low-glycaemic-load diet is the dietary intervention with the strongest clinical support.
Stress and sleep: rising cortisol directly increases both sebum production and the inflammatory response. Disrupted sleep is a common trigger of flares.
Cosmetic and skincare errors: comedogenic products, neglecting heavy make-up removal, over-washing with harsh cleansers (barrier damage → reactive oiliness), alcohol-based toners and vigorous scrubbing all worsen the picture.
Medications: corticosteroids, lithium, some antiepileptics, anabolic steroids and high-dose B12 can cause acneiform eruptions.
Manipulation: squeezing and picking deepens inflammation and multiplies the risk of both post-inflammatory marks and permanent atrophic scars. It is the single most costly habit in acne.
Assessment and Laboratory Work-up
Examination maps lesion types and distribution, records scarring, and assesses skin type and barrier health. In resistant, late-onset or hormonally patterned acne, laboratory work-up follows: total and free testosterone, DHEAS, SHBG, LH/FSH ratio, prolactin, fasting insulin and HOMA-IR, thyroid function, vitamin D and zinc. This is how treatment moves from the skin surface to the cause.
Treatment Steps
Topical therapy (the backbone at every level): retinoids (adapalene, tretinoin) prevent comedone formation and clear existing ones; benzoyl peroxide reduces bacterial load without breeding resistance; azelaic acid is both anti-inflammatory and depigmenting and is safe in pregnancy; salicylic acid supports intraductal clearing. Topical antibiotics should never be used alone — always combined with benzoyl peroxide or a retinoid, otherwise antibiotic resistance is inevitable.
Systemic therapy: in moderate-to-severe inflammatory acne, doxycycline or lymecycline is used at anti-inflammatory dosing alongside topical therapy, generally for no more than 3 months. In hormonal acne, combined oral contraceptives or anti-androgen options are considered. In severe nodulocystic, scarring or fully resistant acne, isotretinoin is the only agent offering definitive resolution — but it requires regular laboratory, lipid and liver monitoring and is absolutely contraindicated in pregnancy, with effective contraception mandatory throughout.
Clinical procedures: medical facials with sterile comedone extraction empty blocked ducts without trauma. Chemical peel series with salicylic acid, mandelic acid or Jessner's solution reduce both active lesions and superficial marks. Acne mesotherapy delivers anti-inflammatory, sebum-regulating and barrier-repairing blends intradermally. Ozone therapy — local application and major autohaemotherapy — adds antimicrobial and anti-inflammatory support, particularly valuable in stubborn inflammatory acne.
Systemic support: correcting zinc, omega-3 and vitamin D deficiency, and in selected cases IV glutathione or high-dose vitamin C protocols, lowers oxidative load and favourably influences healing and pigmentation.
Post-Acne Marks and Scars
Two entirely different problems remain after acne clears, and their treatments diverge completely.
Colour changes (not true scars): post-inflammatory hyperpigmentation (brown marks) and post-inflammatory erythema (persistent redness). These leave no surface depression and fade over time; the process can be accelerated with depigmenting topicals, peels and mesotherapy. See our pigmentation treatment article for details.
Atrophic (depressed) scars: permanent surface irregularities from collagen loss, classified as ice pick, boxcar and rolling. Treatment combines microneedling with PRP, fractional laser, subcision, TCA CROSS and — in selected cases — fillers; typically a programme of 3–6 sessions.
Hypertrophic and keloid scars: raised scars seen especially on the back, chest and shoulders, managed with intralesional corticosteroid, silicone and combined protocols. We cover this in detail in our scar treatment article.
One point is critical: scar treatment does not begin until active acne is under control. Otherwise new lesions develop in the treated area and the effort is wasted.
Course and Expectations
The first meaningful response in acne usually appears at weeks 6–8; clear improvement requires 3–4 months of consistent treatment. A temporary flare (purging) may occur in the first 2–4 weeks of retinoid use; this is an expected response, not a reason to stop. Acne is a chronic disease: once the active phase is controlled, relapse is prevented in most patients with maintenance therapy — usually a topical retinoid. Plans are individual; two cases that look identical can require entirely different protocols.
Let us identify your acne type and the cause behind it.
Book Now