Why does rosacea cause pustules?

What is happening inside the skin?

The innate immune system is the body's first line of defence. In rosacea, that response becomes unusually active. Skin cells release inflammatory signals, while changes in nerve and blood vessel signalling contribute to the wider inflammatory response. Several types of immune cells are involved, rather than one isolated problem. Sunlight, temperature extremes, microbes and stress can stimulate these pathways. Genetics also contributes to susceptibility. Researchers have not established exactly how these systems interact or why one person mainly develops flushing while another develops inflammatory bumps.23

The skin barrier, the protective outer layer, is also impaired in rosacea, allowing microbial colonisation and inflammation. Higher numbers of Demodex mites and changes in skin bacteria may contribute. These are possible contributors within a wider inflammatory process, not a single confirmed explanation for every pustule.1

What is rosacea with pustules?

Rosacea with inflammatory bumps and pustules is often called papulopustular rosacea. Papules are small raised bumps; pustules contain pus. The term papulopustular combines the names of the two types of spots, which saves a word without saving anyone a syllable. These spots commonly occur on the cheeks, nose, chin and forehead, alongside persistent redness or flushing. Rosacea is a lasting condition that can settle and flare again. Redness can be harder to recognise in darker skin, so bumps, burning, stinging and eye symptoms also matter.1245

How are these spots different from acne?

Rosacea can look like acne, but rosacea itself does not produce comedones, the blackheads and whiteheads associated with acne. A dermatologist can distinguish the conditions and choose the right care rather than treating every facial breakout as acne. Another lookalike is perioral dermatitis, which can cause pustules around the mouth, nose or eyes. It usually spares the cheeks and forehead and is often linked to facial steroid creams. If the diagnosis is uncertain, the distribution of the rash and your medication history help a clinician tell them apart.456

What helps rosacea pustules?

Prescription treatments for inflammatory spots include topical ivermectin, metronidazole and azelaic acid. Oral antibiotics are another option when needed. A clinician chooses treatment for the features you have and how much they affect you. Different rosacea treatments target different features, so one tube does not automatically qualify as an entire treatment plan. Brimonidine targets redness, whereas ivermectin helps papules and pustules. Antibiotics do not address every feature, including visible blood vessels. Treatment commonly involves a course lasting two to three months. Follow your prescription's application instructions. If there is no improvement after three months, ask the prescriber to review treatment; severe or unresponsive rosacea warrants specialist assessment.157

What can you change in your routine?

• Use a gentle cleanser and moisturise frequently. Avoid exfoliants and alcohol based facial products.
• Wear broad spectrum sunscreen outdoors, including on cloudy days. A mineral sunscreen with SPF 30 or higher is an option.
• Record symptoms and possible triggers, then avoid the triggers you identify rather than assuming every common trigger affects you.
• Let hot drinks cool before drinking. For exercise, shaded routes and morning or evening sessions can reduce heat and sun exposure.
• Avoid using topical steroids to treat rosacea; they can aggravate the condition.

Tell a clinician about dry, gritty eyes or sensitivity to light. Rosacea can affect the eyes as well as the skin, and inflammation of the cornea, the clear front of the eye, can impair eyesight. Eye symptoms warrant assessment, not just treatment of the facial spots.15