Acne is one of the most common skin conditions, affecting most people at some point in life. Here's what causes it, what actually works, and when to see a dermatologist.
Acne is one of the most common skin conditions, affecting most people at some point in life. Here's what causes it, what actually works, and when to see a dermatologist.
What Is Acne?
Acne happens when hair follicles become clogged with oil (sebum) and dead skin cells, then get inflamed.
- It typically appears on the face, forehead, chest, upper back and shoulders.
- Forms include blackheads (open clogged pores), whiteheads (closed clogged pores), pimples, and cysts/nodules (deep, painful lumps).
- It is very common in teenagers, but it affects adults too — especially women — often around the jaw and chin. Around 85% of people aged 12–24 have had acne at some point (Yale Medicine).
What Causes Acne
Four main processes (American Academy of Dermatology):
1. Excess oil (sebum) production
2. Clogged hair follicles from oil and dead skin cells
3. Bacteria (Cutibacterium acnes, formerly Propionibacterium acnes) growing in blocked follicles
4. Inflammation from the immune response
Hormones play a big role: androgens increase oil production, which is why acne often begins at puberty and can flare around periods in women. Genetics also matter — acne tends to run in families. Stress can worsen existing acne but doesn't cause it on its own, and smoking is linked to more blackheads and whiteheads in women (AAD).
Common Misconceptions
- Chocolate and greasy food: the link is weak. A high-glycaemic diet and dairy may worsen acne in some people, but food is rarely the main cause or the cure.
- Dirty skin: acne is not caused by poor hygiene; scrubbing hard can make it worse.
- Popping pimples: squeezing can push bacteria deeper and cause scarring — avoid it.
- "Fungal acne": itchy, small bumps that look alike on the chest and back may be a separate condition called Malassezia folliculitis, which needs different treatment. If your "acne" is itchy and doesn't respond to usual pimple products, get a proper diagnosis rather than self-treating.
Acne in Adults
Adult acne is common — roughly 20% of women and 8% of men report adult acne, and some studies find about a quarter of women in their 40s still get it (MDPI *Dermatologica*). It often follows a relapsing course, so treatment may need to continue even after skin clears (Indian Journal of Clinical & Experimental Dermatology adult-acne consensus).
In women, persistent adult acne alongside irregular periods, excess facial hair, or weight gain can point to a hormone condition such as PCOS. Indian consensus guidance reports hormonal imbalance in a large share of women with persistent acne, so the right tests can help when acne keeps coming back (PRACT-India consensus).
What Actually Works: Treatment
Cleansing
- Wash your face twice daily and after sweating with a gentle cleanser.
- Avoid harsh scrubbing, which irritates skin.
- Use a non-comedogenic moisturiser (won't clog pores).
Over-the-Counter (OTC) Products
- Benzoyl peroxide: kills bacteria and helps unclog pores; can cause dryness. Start with a lower strength.
- Salicylic acid: helps unclog pores; good for blackheads and whiteheads.
- Adapalene (a topical retinoid): available OTC in some strengths; helps unclog pores and improve skin turnover. Start slowly to avoid irritation.
- Sulphur: helps some people dry up pimples.
Give treatments time: it typically takes 4–8 weeks to see clear improvement, and consistency matters more than intensity. Using too many actives at once irritates skin — use one or two at a time. A combined product with adapalene + benzoyl peroxide is a common first-line approach (PRACT-India consensus).
Prescription Treatments (from a Dermatologist)
- Topical retinoids (tretinoin, tazarotene): first-line, unclog pores and improve texture.
- Topical antibiotics (clindamycin, erythromycin): reduce bacteria; usually combined with benzoyl peroxide or a retinoid and used short-term to avoid resistance.
- Azelaic acid: helps mild acne and post-acne marks, and is considered safe in pregnancy.
- Oral antibiotics (doxycycline, minocycline): for moderate to severe acne. Indian expert guidance recommends using them short-term — around 12 weeks — and in combination, given rising antibiotic resistance (PRACT-India consensus).
- Hormonal therapy (for women): birth control pills or spironolactone, which reduce androgen-driven oil.
- Isotretinoin: a powerful oral retinoid for severe, scarring or treatment-resistant acne. It requires blood monitoring — current guidance wants lipids and liver function documented before starting — and is not suitable for pregnancy (ICMR Standard Treatment Workflow).
- Procedures: chemical peels, extraction, and light/laser therapies can help in selected cases.
Important: severe or scarring acne is best treated early by a dermatologist, because delayed treatment increases the risk of permanent scarring.
Acne in Pregnancy
Acne treatment narrows during pregnancy because many standard products aren't safe. Topical azelaic acid and benzoyl peroxide are generally considered the safest options, while retinoids — including isotretinoin — must be avoided. Always tell your dermatologist if you are pregnant, planning to become pregnant, or breastfeeding so they can adjust your routine (PRACT-India consensus).
When Blood Tests Might Help
Most acne is managed without blood tests. But testing becomes relevant in a few situations:
- Persistent or severe adult acne in women — a hormone assessment can help identify PCOS-related acne. A targeted blood panel (with a doctor's guidance) can guide treatment.
- Acne starting very early — before about age 8, a hormonal evaluation may be suggested (ICMR Standard Treatment Workflow).
- Before starting isotretinoin — a lipid profile and liver function test are typically required before and during treatment (ICMR Standard Treatment Workflow).
Your dermatologist decides which tests, if any, make sense for you. Blood tests don't replace a clinical examination of your skin.
Skin-Care Habits That Help
- Be gentle: use fingertips, not scrubs or brushes on active acne.
- Moisturise: even oily skin needs hydration; dry, irritated skin can worsen acne.
- Sun protection: daily sunscreen (SPF 30+) is important, especially with retinoids, and helps reduce post-acne marks. For darker skin, sunscreen helps prevent dark marks (pigmentation) turning darker.
- Don't pick or pop: let blemishes heal; see a professional for safe extraction.
- Be patient and consistent. Results take time.
Lifestyle Factors
- Diet: some people find a lower-glycaemic diet (fewer sugary, refined foods) and moderating dairy helps their acne, but responses vary greatly. There's no universal "acne diet."
- Stress: stress can trigger flares in some people; managing stress supports overall skin health.
- Sleep and hydration: support skin repair and general health, though they don't cure acne.
- Avoid oily hair products and tight clothing over affected areas, and wash pillowcases regularly.
Acne Scarring and Marks
After acne heals, it can leave dark marks (post-inflammatory hyperpigmentation, PIH) or red marks (post-inflammatory erythema, PIE) or atrophic scars (pits).
- Dark and red marks often fade over months and improve with sunscreen, azelaic acid, or retinoids.
- Scars may need dermatological treatment (microneedling, chemical peels, subcision, lasers) — preventing them by treating acne early is the best approach.
When to See a Dermatologist
See a dermatologist if:
- Over-the-counter products aren't improving acne after several weeks.
- Acne is painful, deep, or leaves scars.
- Acne causes distress or affects your confidence or daily life.
- You're an adult with sudden, severe acne (which can sometimes signal an underlying hormone issue).
The Bottom Line
Acne is a common, treatable skin condition driven by oil, clogged pores, bacteria and inflammation — not by dirty skin or diet alone. A consistent, gentle routine (cleanse, treat, moisturise, protect) paired with appropriate OTC or prescription treatment under a dermatologist's care is the most reliable path to clearer skin. Treating early is the best way to avoid permanent scarring.
This article is for educational purposes only. Acne treatments are not one-size-fits-all, and prescription products require medical supervision. Always consult a dermatologist for personalised advice, especially for severe or scarring acne.
Sources
This information is for general guidance only and is not medical advice. Always consult a qualified doctor about tests, diagnosis and treatment.