Blackheads and blemishes are among the most common skin concerns in Ireland — and among the most persistently misunderstood. There’s an enormous amount of misinformation about what causes them, and an equally large market of products that promise to clear them overnight without addressing the underlying cause. This guide cuts through the noise to explain what actually causes blackheads and blemishes, what the evidence says works, and how to build a routine that delivers lasting improvement.
What Are Blackheads, Really?
Blackheads (open comedones) form when a follicle opening becomes partially blocked with a combination of excess sebum and dead skin cells. Unlike closed comedones (whiteheads), the plug’s surface is exposed to air. Oxidation of the sebum and melanin in this exposure creates the dark colour — not dirt, as is commonly believed. Blackheads are therefore not a hygiene issue; they’re a product of how much oil your skin produces and how efficiently dead skin cells are shed. Over-cleansing in an attempt to remove “dirt” will not clear them and often makes the problem worse by disrupting the barrier and triggering increased sebum production.
What Causes Breakouts and Blemishes?
Breakouts (closed comedones, papules, pustules, cysts) form when a pore is fully blocked and bacteria become involved. Cutibacterium acnes (formerly Propionibacterium acnes) — a naturally occurring skin bacterium — proliferates in the anaerobic (oxygen-free) environment of a blocked pore and triggers an inflammatory immune response. The primary triggers for acne and blemishes in Irish skin include: elevated androgen levels (making hormonal breakouts extremely common around the menstrual cycle, during pregnancy, and at perimenopause); excess sebum production; accumulation of dead skin cells in the pore lining; using skincare products too occlusive for your skin type; and in some individuals, dietary factors, though this varies considerably between people.
The American Academy of Dermatology categorises acne by severity — from comedonal (non-inflammatory blackheads and whiteheads) through mild-moderate inflammatory acne (papules and pustules) to severe nodulocystic acne — and emphasises that moderate-to-severe acne should be assessed and treated by a GP or dermatologist, not solely managed through skincare.
The Most Effective Ingredients for Clearing Blemishes
Salicylic Acid (BHA)
The gold standard for congested, blemish-prone skin. As an oil-soluble beta hydroxy acid, salicylic acid can penetrate the oil-filled pore environment that water-soluble AHAs cannot reach. Inside the pore, it dissolves the excess sebum and dead cell debris that cause blockages, progressively clearing existing congestion and preventing new comedones forming. Use in a serum or toner at 1–2% concentration, two to three evenings per week, increasing to nightly as your skin adjusts. See our full guide to Skincare Acids Explained for usage guidance.
Niacinamide
Niacinamide (vitamin B3) regulates sebum production by modulating the activity of sebaceous glands, reduces post-breakout redness and PIH (post-inflammatory hyperpigmentation), and strengthens the skin barrier to reduce the reactivity that accompanies acne-prone skin. Critically, unlike most acne-focused ingredients, niacinamide is not drying — making it an essential pairing with salicylic acid in a blemish routine. A randomised controlled trial published in the International Journal of Dermatology found 4% niacinamide gel as effective as 1% clindamycin for reducing acne over 8 weeks, without the antibiotic resistance concerns associated with topical antibiotics.
Azelaic Acid
Anti-inflammatory and antibacterial, with the added benefit of fading post-acne marks by inhibiting tyrosinase-driven melanin overproduction in healing skin. Azelaic acid is particularly suited to Irish skin with both breakouts and redness (a common combination), as it addresses both simultaneously without the potential irritation of stronger retinoids. It’s also one of the few effective acne actives considered safe to use during pregnancy.
Retinol and Bakuchiol
Both increase skin cell turnover, preventing the dead cell accumulation inside pores that leads to comedone formation. Retinol is a powerful acne treatment with decades of clinical evidence, but can cause significant initial dryness and irritation for Irish sensitive skin. Bakuchiol — the plant-derived alternative derived from babchi seeds — stimulates retinoid receptors with similar anti-acne and cell-renewal effects but at lower irritation rates. See our guide to Bakuchiol: The Natural Retinol Alternative.
What Not to Do for Blackheads and Blemishes
- Don’t squeeze blackheads — manual extraction without proper technique and sterilised equipment pushes bacteria deeper into the follicle and increases the risk of permanent scarring and PIH. Professional extraction by a trained facialist is a different matter, but DIY squeezing is consistently counterproductive.
- Don’t use harsh, stripping cleansers — over-cleansing disrupts the acid mantle and triggers reactive sebum overproduction. A gentle, pH-balanced cleanser used twice daily is more effective for congested skin than a strong foaming cleanser.
- Don’t stack multiple acids simultaneously — using a glycolic acid toner, salicylic acid serum, and benzoyl peroxide on the same evening will not clear breakouts faster; it will strip the barrier and create a cycle of sensitivity and increased reactivity.
- Don’t expect overnight results — acne and congestion reflect months of sebum and dead cell buildup inside pores. Clearing this process takes four to twelve weeks of consistent treatment, not a few applications.
Building a Routine for Blemish-Prone Irish Skin
The most effective routine for congested Irish skin is a consistent, simple one. Morning: gentle pH-balanced cleanser, niacinamide serum, lightweight non-comedogenic moisturiser, broad-spectrum SPF. Evening: gentle cleanser, salicylic acid toner (2–3 nights per week) or azelaic acid serum (daily), lightweight moisturiser. Once the skin is stable, introduce a bakuchiol serum two to three evenings per week for long-term cell turnover and collagen support.
Resist the temptation to add more products. Acne-prone skin benefits from simplicity — fewer ingredients means fewer potential irritants and comedogenic triggers. Our Nordic face serums are formulated with barrier-supportive botanical actives that work alongside targeted blemish treatments without exacerbating congestion. Browse our full serums collection and moisturisers.
Frequently Asked Questions
What actually causes blackheads on the nose?
The nose has a particularly high density of sebaceous glands, making it the most common site for blackhead formation. Blackheads on the nose are open comedones — oxidised plugs of sebum and dead cells — not embedded dirt. Regular BHA exfoliation (salicylic acid) is the most effective long-term treatment for nose blackheads, as the oil-soluble acid can penetrate the oil-filled pore to dissolve the blockage from within.
Should I use a pore strip for blackheads?
Pore strips physically pull the surface portion of blackheads out, providing temporary visible results but not addressing the root cause (excess sebum production and dead cell buildup in the pore). They also have no effect on the lower portions of the comedone still embedded in the pore, and can cause capillary damage or irritation if overused. BHA exfoliation used consistently over 4–6 weeks is more effective and produces lasting improvement.
Is hormonal acne different from regular acne?
Yes, in its pattern and triggers. Hormonal breakouts are driven by androgen fluctuations and typically appear along the jawline, chin, and lower cheeks in a cyclical pattern (often pre-menstrually). The skin’s own inflammatory response is amplified by hormone-driven sebum surges. Consistent BHA, niacinamide, and azelaic acid are helpful, but for significant hormonal acne, a GP assessment is worthwhile — hormonal interventions (like certain contraceptives or spironolactone) can address the root cause that topical skincare cannot.
Why do I still get breakouts despite a good skincare routine?
Possible causes include: a product in your routine that is comedogenic for your specific skin (patch testing new products is important); hormonal factors that skincare cannot fully address; insufficient or inconsistent use of your BHA or cell-turnover active; or dietary triggers. Diet’s role in acne is highly individual — high-glycaemic foods and dairy have the strongest evidence for exacerbating acne in susceptible people. A food diary for 4–6 weeks can help identify personal triggers.
Can diet affect blackheads and blemishes?
For many people, yes. Research published in the American Journal of Clinical Nutrition found that a low-glycaemic diet significantly reduced acne lesion count over 12 weeks compared to a high-glycaemic control diet. High-glycaemic foods spike insulin, which triggers increased androgen activity and sebum production. Dairy, particularly skim milk, has also been associated with acne severity in multiple studies, though the mechanism is not yet fully understood.