Article · June 23, 2026
The Single Nerve Pathway Behind Every Rosacea Trigger
Heat, stress, red wine, and exercise feel like unrelated rosacea triggers. The mechanism says they all flip one nerve circuit, and that changes what is worth tracking.
Articles
Writing on rosacea, grounded in the literature.
Trigger explainers, methodology notes, and category analysis. Primary-source citations on every clinical claim.
Article · June 19, 2026
"What subtype of rosacea do I have?" is now the wrong question
Dermatology retired the four-subtype model in 2017. Here is why 'which subtype am I?' sends rosacea patients down the wrong path, and what to track instead.
Article · June 15, 2026
Ten Sources Tell You to Keep a Rosacea Diary. None Tell You How.
Every clinical authority recommends documenting your rosacea before treatment. None of them specify the documentation standard a dermatologist can actually read. Here is what that standard looks like.
Article · June 11, 2026
The Appointment-Timing Gap: Why Rosacea Is Hard to Diagnose in 15 Minutes
Rosacea's signs appear and resolve, so a visit booked weeks after a flare often captures a calm face. The record you bring matters more than the exam.
Article · June 8, 2026
How to Find Your Own Rosacea Triggers: The n=1 Method
Trigger lists describe crowds, not faces. The only study that can find your rosacea triggers is the one you run on yourself.
Article · June 4, 2026
Rosacea and the Gut: What the Microbiome Data Actually Shows (and What's Still Speculation)
Meta-analysis ties rosacea to gut disturbances like SIBO. That is a replicated signal, not the probiotic-cure story circulating on Reddit. Here is where the evidence actually stops.
Article · May 28, 2026
The 16-million-person rosacea-tracking category that doesn't exist.
Roughly 16 million Americans have rosacea. The category for tools that help them track it is one of the largest underbuilt niches in consumer health software. The published critiques converge on a small set of structural failures: phenotype-incorrect onboarding, collapsed severity scoring, ignored ocular phenotype, no skin-tone-equity work, and photo pipelines that fail serial comparability. This is the category-level argument for why a new entrant is worth building.
Article · May 28, 2026
The post-COVID rosacea wave: what 2002 surveys can't tell you.
The canonical NRS 2002 trigger list is a great patient-survey dataset and it is also missing the largest single new rosacea-trigger event of the last decade. A 34 percent post-COVID exacerbation rate in one retrospective study and a 28.8 percent post-infection rate in a 2025 cross-sectional study describe a trigger pattern the 2002 framing has no field for.
Article · May 28, 2026
Why every dermatology app fails at clinical photography.
Auto white balance is explicitly discouraged in serial clinical photography. Flash creates specular hotspots that destroy erythema scoring. Standardized lighting, manual white-balance lock, fixed distance, dark blue background for skin of color: these are not opinions. They are the published protocol. Almost no consumer dermatology app implements any of them. The result is a photo set you cannot serially compare.
Article · May 28, 2026
Demodex: the rosacea factor most patients have never heard of.
Rosacea patients have roughly 4 times the Demodex mite density of healthy controls. Topical ivermectin, which kills the mites, reduces rosacea lesions in randomized trials. The mites are there, the treatment that targets them works, and the causal story is still being worked out. We are going to explain what the literature actually says and what it doesn't, in plain language, without recommending you do anything beyond bring this up with your dermatologist.
Article · May 28, 2026
The estrogen-protective hypothesis: why menopause sometimes resolves rosacea.
Postmenopausal patients sometimes report their rosacea getting better, not worse, when the literature might predict the opposite. The Nurses' Health Study II analysis on exogenous hormones found that menopausal hormone therapy and oral contraceptives are dose-responsively associated with increased incident rosacea risk. Both findings line up with an estrogen-modulated mechanism dermatology has been quietly working out for years.
Article · May 28, 2026
Red wine ≠ white wine, a 20-year trigger taxonomy story.
Two separate strands of rosacea-and-alcohol research disagree at first glance, then reconcile in a way that matters at a wedding dinner. The NRS 2010 acute-flushing survey put red wine far ahead of white as a trigger. The Li 2017 NHS cohort found white wine and liquor associated with incident rosacea risk and red wine, not statistically associated. The disagreement is real, and the two findings are about different things.
Article · May 28, 2026
It's the temperature, not the caffeine.
Most rosacea patients learn from forum lore that they have to give up coffee. The published evidence is the opposite. A case-control study found that 60°C water and 60°C coffee produced equivalent flushing, and both at 22°C did not. A 82,737-woman cohort showed caffeine intake is inversely associated with incident rosacea risk. The trigger is the heat, not the chemistry.
Article · May 28, 2026
What dermatologists actually want from your tracking app, and what they hate.
The published preferences are clear and the consumer-app category has mostly ignored them. Dermatologists want a single-page summary with the flare count, the top trigger co-occurrences, two photos, and the quality-of-life trend. They explicitly do not want 90 daily photos, a dashboard URL, or a pseudo-diagnostic score the patient pulled off an app. The 12-minute visit makes this concrete.
Article · May 28, 2026
Why your rosacea app should be tracking your eyes.
Ocular involvement affects 50 to 72 percent of cutaneous rosacea patients, and in a meaningful subset it shows up before the facial component does. The 2017 phenotype framework lists ocular manifestations as a major phenotype, on its own line, with diagnostic weight. Most rosacea trackers don't have a field for it.
Article · May 28, 2026
Why every rosacea severity score feels broken.
Patients complain that their tracker's single severity number doesn't reflect what their face is actually doing. It turns out that complaint matches a published critique of the Investigator Global Assessment scale that dermatology has been working with for years. The collapse-into-one-number problem is structural, not a UX bug.
Article · May 28, 2026
Rosacea on every skin tone, the underdiagnosis problem nobody's solving.
Reported rosacea prevalence in Fitzpatrick IV-V skin sits at roughly 6 to 8 percent of the rosacea-diagnosed population. The literature is explicit that a meaningful share of that gap is diagnostic masking, not biology. Telangiectasia is harder to see against pigmented skin, and the dermatology image-classification models trained to spot it perform 3 times worse on darker skin than on lighter. We built Skinframe to not make that mistake worse.
Article · May 28, 2026
Rosacea apps haven't gotten the 2017 update.
In 2017, the dermatology field formally retired the four-subtype rosacea model and replaced it with a phenotype framework. Nine years later, every rosacea-named tracker on the App Store still opens with "which type of rosacea do you have?" That question has a name in the literature, and the literature has moved on.