Why Rosacea Gets Worse in Summer (and What Helps)
August is the month people give up on their rosacea.
Not because it has got worse in some permanent way, but because they have spent the summer doing everything they were told, and their face is still red at four in the afternoon. So they conclude that nothing works, stop the routine, and arrive in September with an inflamed face and a shoebox of half-used products.
I would like to head that off, because summer rosacea is predictable, and predictable is a good thing. It means you can plan for it.
What is actually happening when rosacea flares
Rosacea is a long-term inflammatory condition affecting the facial skin, and the part that matters for understanding summer is that it involves the blood vessels.
In rosacea-prone skin, the small vessels in the face respond too readily and take too long to settle. A trigger arrives, the vessels widen, blood flow to the surface increases, and the skin goes red and hot. In skin without rosacea, that response is brief and unremarkable. In rosacea, it lasts longer and it happens more easily.
Over years of repeated flushing, that redness becomes less willing to fade completely, and visible thread veins can appear. This is why treating a flare as a nuisance to be endured is a mistake. Each one is not just an inconvenient afternoon. Reducing how often they happen is the whole strategy.
There are also inflammatory pathways in the skin that are overactive in rosacea, which is why it involves spots and bumps in some people and mostly redness in others. Ultraviolet light activates those same pathways, which brings us neatly to summer.
The three summer triggers that matter most
Surveys of people with rosacea consistently put sun exposure at the top of the trigger list, with heat and emotional stress close behind. In practice, three things account for most of what I see in August.
Sun. Ultraviolet light does two things at once. It sets off the inflammatory response directly, and over time it damages the connective tissue in the dermis that supports and holds the small blood vessels in place. Weaker support means vessels that widen more easily and recover less well. Sun exposure is not one trigger among many. It is the one that also makes all the others worse over the long run.
Heat. This one is separate from sun, and people conflate them constantly. It is the temperature that causes the vessels to widen, not only the light. Which means a hot kitchen, a hot bath, a sauna, a stuffy train, and a hard workout in an unairconditioned gym are all triggers on a cloudy day. If your face flares indoors in August, you are not imagining a sun problem you did not have. You have a heat problem.
Alcohol. Red wine has the worst reputation and it is largely deserved, though any alcohol widens blood vessels. Add a warm evening, a garden, and three glasses, and you have assembled almost every trigger at once. I am not going to tell you never to drink in the summer. I am going to tell you that if you are wondering why Sundays are bad, this is usually the answer.
Two more that catch people out: spicy food, and going from hot to cold too fast. Standing in front of an open freezer to cool down feels wonderful and does your face no favours at all.
Related reading: Sun protection is the single highest-value change for rosacea, and the wrong sunscreen makes things worse rather than better. The full guide, including which filters to avoid: The Best Sunscreen for Rosacea and Sensitive Skin.
Why mineral sunscreen tends to suit reactive skin better
Sunscreens use two broad types of filter, and the SPF (sun protection factor) number on the bottle tells you nothing about which type you are holding.
Mineral filters, zinc oxide and titanium dioxide, sit on the surface and reflect and scatter light away from the skin. Chemical filters absorb ultraviolet light and convert it into a small amount of heat, which is released from the skin.
For most people that difference is academic. For rosacea it is not, for two reasons. The first is that heat is itself a trigger, so a filter that works by producing a little of it is not the obvious choice for skin that flares at the sight of a warm room. The second, and in practice the bigger one, is tolerance. Chemical filters sting more often on a compromised skin barrier, and rosacea skin very often has a compromised barrier. A sunscreen that stings is a sunscreen that gets abandoned by the second week of July.
The best sunscreen for rosacea, genuinely, is the one you will put on every morning without dreading it. If that happens to be a chemical filter that your skin tolerates perfectly well, use it. But mineral is where I would start, at SPF 50, applied properly rather than smeared on as an afterthought.
What I would reach for in August:
Heliocare 360° A-R Emulsion SPF 50
£25.50
Heliocare 360° Mineral Tolerance Fluid SPF 50
£23.50
Understanding Rosacea: A 21-Day Awareness Guide
£5
What to take out of your routine this month
More rosacea is made worse by an overloaded routine than by a missing product. In a flare month, take things away.
Stop the strong exfoliating acids while you are flaring. A high-strength glycolic acid on inflamed skin in August is a bad plan. Once things are calm, reintroduce gently.
Check your labels for fragrance, alcohol denat, menthol, camphor, eucalyptus and witch hazel. These turn up in an enormous number of products marketed as soothing, and for rosacea skin they are frequently the problem rather than the solution. Anything that produces a cooling tingle is doing so by irritating you.
Wash in lukewarm water, not hot. And skip the very hot shower after the gym in August, which is a heat trigger arriving on top of an exercise trigger.
Do not use ice directly on your face to calm a flare. Fast temperature swings in either direction provoke the vessels. A cool, damp flannel is better than anything from the freezer.
Keep the barrier supported. A plain, fragrance-free moisturiser twice a day, unglamorous and consistent, does more in a flare month than any active ingredient.
When to stop managing this yourself
Rosacea is a medical condition, not a skincare inconvenience, and there is a point at which self-management stops being the right answer.
Speak to your GP if you have persistent spots and bumps rather than redness alone, if the redness is not settling between flares, if thread veins are becoming established, or if it is affecting how you feel about going out. There are effective prescription treatments and they work considerably better than anything available over the counter. Getting them is a conversation with your GP, not something to be sourced online.
And if your eyes are involved, gritty, dry, sore or repeatedly inflamed lids, take that seriously and get it looked at. Ocular rosacea is common, under-recognised, and needs proper assessment rather than eye drops from a supermarket.
For everything short of that, a skin consultation at Debora Tentis Clinic will work out which triggers are actually yours, get the routine down to what your skin can tolerate, and put a plan in place before next summer rather than during it.
Shop
Heliocare 360° A-R Emulsion SPF 50
£25.50
Heliocare 360° Mineral Tolerance Fluid SPF 50
£23.50
Heliocare 360° Pediatrics Mineral
£23.50
Understanding Rosacea: A 21-Day Awareness Guide
£5
The Skin–Gut–Mind Connection Guide
Free
NEOSTRATA Clarify Sheer Hydration SPF40
£40
Keep reading: Food is the trigger category people most want a clear answer on, and the honest answer is more interesting than the lists circulating online: Rosacea and Food: What to Eat and Avoid for Calmer Skin.
Debora Tentis is a Women's Health Pharmacist, Independent Prescriber Trainee and aesthetics practitioner at Debora Tentis Clinic, Milton Keynes. This post is for educational purposes only and does not constitute medical advice.
