Rosacea: Causes, Triggers, and Treatment Options Online

Rosacea is classified into four main subtypes, though many people experience features of more than one subtype at the same time. Understanding which type or combination of types is present helps guide the treatment approach.

Subtype 1: Erythematotelangiectatic Rosacea (ETR)

This is the most common presentation and is characterised by persistent facial redness, frequent flushing, and visible blood vessels (telangiectasia) on the cheeks and nose. The skin may feel sensitive, and many people report a stinging or burning sensation. Flushing episodes can be triggered by heat, exercise, emotional stress, alcohol, or spicy food, and over time the background redness tends to become more constant.

Subtype 2: Papulopustular Rosacea

Sometimes called "acne rosacea," this subtype involves persistent redness accompanied by acne-like breakouts: red bumps (papules) and pus-filled bumps (pustules), typically across the central face. It is frequently misdiagnosed as adult acne, but the two conditions are clinically distinct and respond to different treatments. Unlike acne, papulopustular rosacea does not typically involve blackheads or whiteheads (comedones), and using acne products containing benzoyl peroxide or strong retinoids can irritate rosacea-affected skin further.

Subtype 3: Phymatous Rosacea

This is a less common but more visible subtype, characterised by thickening of the skin, irregular surface texture, and enlargement of the affected area. The most well-known presentation is rhinophyma, a gradual thickening and enlargement of the nose. Phymatous rosacea is more common in men and typically develops after years of undertreated or untreated rosacea. Early treatment of other subtypes may help reduce the risk of progression to phymatous changes.

Subtype 4: Ocular Rosacea

Rosacea can also affect the eyes, causing redness, dryness, irritation, a gritty or burning sensation, and sensitivity to light. Ocular rosacea can occur alongside facial rosacea or on its own, and it is frequently underdiagnosed because the symptoms overlap with common dry eye conditions. According to the Australasian College of Dermatologists, up to half of people with facial rosacea may also experience ocular symptoms. Left untreated, ocular rosacea can lead to complications affecting the cornea, so raising eye symptoms during a GP consultation is worthwhile.

Identifying the subtype or combination of subtypes is something a GP can do during a standard consultation, including via video. Rosacea is diagnosed clinically based on the pattern, distribution, and characteristics of the skin changes, without the need for blood tests or biopsies in most cases.

One of the most practical aspects of managing rosacea is learning which triggers make it worse. Rosacea causes flare-ups in response to a wide range of environmental, dietary, and physiological triggers, and these vary significantly from person to person. Keeping a simple diary of flare-ups and what preceded them is one of the most useful things someone with rosacea can do. Over time, patterns emerge.

The most commonly reported triggers include:

• Sun exposure and UV radiation. This is consistently identified as the single most common trigger for rosacea flare-ups. The Australian sun is particularly relevant here. Broad-spectrum sunscreen with SPF 30 or higher, worn daily, is a foundation of rosacea management regardless of subtype. Physical (mineral) sunscreens containing zinc oxide or titanium dioxide are often better tolerated on sensitive rosacea-prone skin than chemical sunscreens.

• Heat and temperature changes. Moving from a cold environment into a heated room, hot showers, saunas, and exercising in hot weather can all trigger flushing episodes. Some people find that keeping a cool cloth nearby during exercise, choosing cooler times of day for outdoor activity, and avoiding prolonged hot baths helps manage this trigger.

• Spicy food and hot drinks. Capsaicin in spicy food and the thermal heat of hot beverages (tea, coffee, soup) are common dietary triggers. The trigger is the heat itself as much as the spice, so allowing hot drinks to cool before drinking them is a practical step.

• Alcohol. Red wine is the most frequently cited alcoholic trigger, but beer, spirits, and white wine can also cause flushing. Alcohol causes vasodilation, which directly worsens the facial redness and flushing associated with rosacea.

• Emotional stress and anxiety. Stress is a well-documented rosacea trigger. This creates something of a vicious cycle, as visible facial redness can itself be a source of self-consciousness and stress. Managing stress through whatever works for the individual, whether that is exercise, mindfulness, professional support, or simply protecting downtime, can form part of a broader rosacea management plan.

• Wind and cold weather. Harsh wind and cold air can irritate the already compromised skin barrier in rosacea-prone skin. Wearing a scarf or buff across the lower face during cold, windy weather can help.

• Skincare products. Many conventional skincare products contain ingredients that can aggravate rosacea, including alcohol-based toners, fragrance, menthol, witch hazel, and some exfoliating acids. Switching to a gentle, fragrance-free skincare routine is a standard recommendation. A GP can advise on which ingredients to avoid based on the specific subtype.

• Medications. Some medications, including certain blood pressure drugs that cause vasodilation, can worsen rosacea symptoms. This is something to flag during a GP consultation so that the full medication picture is considered.

Avoiding every trigger all the time is not realistic, and it is not the goal. The goal is awareness. Knowing which triggers are most relevant helps in making practical, day-to-day choices that reduce the frequency and severity of flare-ups. A GP can help put triggers in context and integrate avoidance strategies into a treatment plan that addresses the condition from multiple angles.

There is no cure for rosacea, but a range of treatments can significantly reduce symptoms and improve quality of life over time. The right approach depends on the subtype, the severity of symptoms, individual skin sensitivity, and the patient's treatment history. A GP is the best person to tailor a plan, and that plan will often evolve as the condition is better understood.

Topical Prescription Treatments

For mild to moderate rosacea, topical treatments are usually the first line of management.

• Metronidazole cream or gel is one of the most commonly prescribed topical treatments for rosacea in Australia. Applied once or twice daily, it has anti-inflammatory properties that can help reduce the redness and papules associated with subtypes 1 and 2. Clinical studies, including those cited by DermNet NZ, have shown it to be effective in reducing inflammatory lesions over 8 to 12 weeks of use.

• Azelaic acid (available in prescription-strength formulations) is another effective option, particularly for papulopustular rosacea. It works by reducing inflammation and has mild antibacterial properties. Some patients find it helpful for reducing both redness and bumps.

• Ivermectin cream targets the Demodex mite that is found in elevated numbers on rosacea-affected skin. It is applied once daily and has been shown in published research to be effective for inflammatory rosacea, sometimes more so than metronidazole for certain presentations.

• Brimonidine gel works differently from the above. Rather than treating the underlying inflammation, it temporarily constricts the blood vessels in the face, reducing visible redness for several hours after application. It can be useful for people whose primary concern is persistent facial redness rather than papules or pustules.

Oral Prescription Treatments

For moderate to severe rosacea, or when topical treatments alone are not providing adequate improvement, a GP may consider oral medications.

• Low-dose doxycycline is frequently prescribed at a sub-antimicrobial dose for its anti-inflammatory properties. At this dose, it does not act as an antibiotic but reduces the inflammatory processes driving rosacea. It is generally well tolerated, though sun sensitivity is a known side effect, which is particularly relevant in Australia.

• Other oral antibiotics, such as minocycline, may be used in certain cases, though they are typically reserved for more severe presentations and prescribed for limited durations to manage antibiotic resistance concerns.

• Isotretinoin (commonly known by its former brand name Roaccutane) may be considered for severe or treatment-resistant rosacea, particularly phymatous rosacea. It is prescribed at lower doses than for acne and requires careful monitoring by a GP or dermatologist due to its side effect profile.

All oral treatments require a consultation with a GP who can assess whether they are appropriate based on the individual's full health picture, existing medications, and any contraindications.

Over-the-Counter Options

While prescription treatments form the backbone of effective rosacea management, several over-the-counter options can support the treatment plan.

• Gentle, fragrance-free cleansers and moisturisers help maintain the skin barrier, which is frequently compromised in rosacea. Look for products formulated for sensitive skin.
• Mineral sunscreen (SPF 30+) is non-negotiable for rosacea management. Daily application, even on overcast days, helps prevent UV-triggered flare-ups.
• Green-tinted colour correctors or mineral makeup can help reduce the visible appearance of redness for those who find it affects their confidence. These are cosmetic rather than therapeutic but can make a genuine difference to how someone feels day to day.
• Niacinamide-based products may help strengthen the skin barrier and reduce redness in some people, though evidence specific to rosacea is still emerging.

A treatment plan that combines the right prescription medication with a supportive skincare routine and trigger avoidance tends to produce the best long-term results. This is not a condition that responds well to a single product or a quick fix. It responds to sustained, consistent care.