Rosacea
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Direct answer
Recurrent flushing over the cheeks, nose, forehead and chin that persists as erythema with telangiectasia, then crops of papules and pustules — with no comedones anywhere — is rosacea, a chronic central-facial disorder of neurovascular dysregulation amplified by Demodex mites, not acne and not infection. Subtypes steer therapy: erythematotelangiectatic disease needs trigger control, sun protection and brimonidine gel for redness; papulopustular disease responds to topical metronidazole, azelaic acid or ivermectin with oral doxycycline at the 40 mg modified-release anti-inflammatory dose; phymatous change (rhinophyma) requires surgical or laser reshaping; ocular rosacea causes blepharitis and keratitis and threatens sight. The cardinal sin is applying topical corticosteroids to the face — they manufacture steroid rosacea, a daily diagnosis in Indian dermatology OPDs.
What you must remember
- Four subtypes: erythematotelangiectatic (flushing, persistent erythema, telangiectasia), papulopustular (central-face papules and pustules), phymatous (glandular thickening, rhinophyma in older men), ocular (dryness, blepharitis, keratitis).
- Acne discriminator: rosacea has no comedones, is central-faced, flushes, and lacks the seborrhoeic greasy scale; perioral sparing helps; acne comedones sit at the border of every lesion.
- Trigger map: sunlight, heat and humidity, alcohol, spicy food, hot beverages, exercise and emotional stress — trigger diaries outperform prescriptions in mild disease.
- Topical arsenal: metronidazole 0.75-1%, azelaic acid 15%, ivermectin 1% cream (targets Demodex-driven disease); brimonidine 0.33% gel or oxymetazoline for persistent erythema.
- Oral doxycycline at 40 mg modified-release: anti-inflammatory, sub-antimicrobial dosing — effective without selecting resistance; courses run 6-12 weeks.
- Ocular rosacea: gritty eyes, lid margin inflammation, recurrent chalazia; keratitis can scar — lid hygiene, artificial tears and ophthalmology referral are part of skin treatment.
- Steroid rosacea: fluorinated or potent steroids applied for "fairness" or quick relief produce rebound erythema, papules and telangiectasia — withdraw gradually, never abruptly with a flare-explainer.
- Differential anchors: seborrhoeic dermatitis (greasy scale, nasolabial), lupus (ANA when photosensitive rash + arthralgia), demodex dermatitis, steroid damage.
Mapping subtype to prescription
A 38-year-old woman labelled "adult acne" reports five years of flushing with spicy food, red-cheek persistence, and small papules on the cheeks; examination shows pustules without a single comedone and conjunctival injection with lid crusting. Reason it out: papulopustular rosacea with ocular overlap. Step one is subtraction — stop the over-the-counter betamethasone cream she has been using, tapering over two weeks with a warning about rebound, because steroid-damaged face is the commonest aggravator in Indian practice. Step two is topical therapy — ivermectin 1% or metronidazole nightly for eight to twelve weeks — plus doxycycline 40 mg modified-release daily if lesions are dense. Step three is prevention — mineral sunscreen, trigger diary, micellar cleansing. Step four addresses what remains: persistent background erythema after the papules clear responds to brimonidine gel for occasions and vascular laser for durable effect. Step five closes the loop at the eyes: lid hygiene and artificial tears, with ophthalmology if keratitis is suspected.
The teaching point to carry: rosacea therapy is staged — subtract the steroid, clear the papules, then treat the redness — because treating redness first wastes money and treating papules with steroids deepens the hole.
How the Indian exam frames it
Indian examiners test rosacea against three neighbours. Against acne: no comedones, older age, flushing, central face — and acne treatments such as benzoyl peroxide and retinoids irritate rosacea rather than treat it. Against seborrhoeic dermatitis: dry greasy scale in nasolabial folds versus flush-prone erythema without scale. Against lupus: malar photosensitivity with arthralgia earns an ANA, isolated flushing does not. The Indian clinical reality deserves a sentence in any viva: unsupervised topical steroid use on faces — driven by fairness marketing and over-the-counter access — creates steroid-damaged, demodex-heavy, treatment-resistant rosacea that must be unwound slowly; and hot, spicy diets plus high ambient heat make trigger counselling genuinely therapeutic rather than theoretical.
Frequently asked questions
How is rosacea distinguished from acne vulgaris?
Rosacea flushes, sits centrally, shows telangiectasia and has no comedones; acne has comedones, affects younger patients with oily skin and truncal lesions.
Why is doxycycline given as 40 mg modified-release in rosacea?
This sub-antimicrobial dose is anti-inflammatory without antibacterial pressure — efficacy preserved, resistance and microbiome disruption avoided.
Why are topical steroids forbidden on rosacea?
They initially blush out redness, then produce rebound erythema, papules and telangiectasia — steroid rosacea that is harder to treat than the original disease.
What are the features of ocular rosacea?
Grittiness, dryness, blepharitis, recurrent chalazia and potentially sight-threatening keratitis — managed with lid hygiene, tears and ophthalmology input.
What treats persistent background erythema?
Vasoconstrictor agents (brimonidine gel, oxymetazoline cream) for intermittent use and pulsed-dye or vascular laser for durable reduction.