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Vasculitis urticarialis
When a wheal stays in one place for more than a day, burns rather than itches and leaves a bruise, it is no longer ordinary hives — and the skin sample has to come from a fresh lesion, before cortisone is taken again.
Also known as: hives that bruise · hypocomplementaemic urticarial vasculitis
Open in the tool — with search and all the links →This compilation is for information and replaces neither medical diagnosis nor treatment. If you have symptoms, see a doctor.
Urticarial vasculitis looks like ordinary hives and yet it is something else: an inflammation of the smallest blood vessels in the skin. The difference lies not in the overall picture but in how a single wheal behaves. An ordinary wheal moves, rarely stays in one place for more than a day and vanishes without a trace. Here it stays put for more than twenty-four hours, burns or hurts rather than itches, and leaves a bluish and later brownish mark as it heals — a small bruise. This can be watched at home: draw a ring around a fresh wheal with a ballpoint pen and look again the next day. Only a skin biopsy settles the question, and it has to be taken from a fresh lesion; under cortisone the finding heals away and the sample then shows nothing. Two forms are distinguished. If the complement values C3 and C4 are normal, the illness usually stays confined to the skin and runs a mild course. If they are low, or if anti-C1q antibodies are present, the joints, lungs, kidneys and eyes deserve a look as well. Often there is nothing behind it; sometimes a medicine, a viral infection, an autoimmune disease, rarely a blood disorder. Antihistamines alone usually achieve too little here — one of the reasons the distinction is worth making.
Ring a fresh wheal with a ballpoint pen, note the time, look again after twenty-four hours. If it is gone, that speaks for hives; if it is still inside the ring, for this diagnosis. It is the cheapest and most telling examination there is here.
The diagnosis is made under the microscope. The sample should come from a lesion less than one to two days old — from an old one the result often comes back unremarkable, and that does not answer the question.
Cortisone heals the lesion away — and with it what the sample is meant to show. Anyone waiting for a biopsy therefore calls at the first new flare, before reaching for the tablet again. It is the one point where days matter.
C3, C4 and anti-C1q separate the mild form from the one that goes further. A single blood test that orders the whole rest of the workup.
Protein and blood in the urine are the early warning system for the kidneys. A dipstick costs almost nothing and is the test most easily forgotten.
Some cases go back to a medicine, often an anti-inflammatory painkiller or an antibiotic. The complete list, with start dates, belongs at the first appointment — including everything bought without a prescription.
Flares do not keep to appointments. A dated photo, plus one of the same spot the day after, replaces a long description and shows exactly what matters.
A threadworm can stay silent in the gut for decades and, under cortisone, biologicals or other immune suppression, flood lung and bloodstream. Anyone who ever went barefoot in the tropics or subtropics is looked for beforehand with a blood test — one effort, and it prevents the worst course this worm has.
Antihistamines work distinctly less well here than in ordinary hives — that in itself is a clue to the diagnosis. What works intervenes in the inflammation: colchicine, dapsone, hydroxychloroquine, and in severe cases cortisone and stronger drugs. It is judged after four to eight weeks. The difference from hives lies in time and trace: the weals last more than twenty-four hours and leave a brownish mark.
The difference from ordinary hives lies in time: the weals last more than twenty-four hours — often up to three days — and leave a brownish mark that stays for weeks. About one to two per hundred thousand people a year are affected. The diagnosis needs a skin sample taken within forty-eight hours of a weal appearing. In about half an underlying illness is found; complement C4 is low in the more severe form.
This is the most important sign and the only one that can be checked without a doctor. An ordinary wheal moves; this one stays.
Hives almost always itch. If it burns, hurts or feels tight instead, that shifts the direction.
As it heals a bluish, then brownish discolouration remains, often on the legs. It is exactly this trace that separates the two illnesses.
Even at a high dose little changes. That is not a failure of treatment but a hint that the histamine route is not the decisive one.
In the form with low complement, aching joints, tiredness and occasionally abdominal pain are often added.
In ordinary hives CRP and ESR are usually normal. Here they are often slightly raised — but not always, and normal values rule nothing out.
Together with C4 this value splits the illness in two. Normal usually means the milder form, confined to the skin.
Low together with C3 it points to the form that can also involve joints, lungs and kidneys. When normal it incidentally makes a C1 inhibitor deficiency very unlikely.
Antibodies against one building block of the complement system. If present, the workup widens; if absent, the matter usually stays with the skin.
The screening test for autoimmune disease. A negative result eases the suspicion of a lupus, which can accompany urticarial vasculitis.
The simplest look at the kidneys. If protein and blood in the urine stay negative over time, kidney involvement is unlikely — which is why the dipstick belongs to every check.
With chronic inflammatory and autoimmune pictures low levels are common — partly because the illness itself lowers the level, partly because less time is spent outdoors. Whether correcting it changes the course is being studied; for bone and muscle it is worthwhile regardless.
They give rise to messengers that tend to end inflammatory reactions rather than fuel them. Oily sea fish twice a week is the simplest route; capsules are an option but replace no treatment.
Needed for steering the defences and for the healing of tissue. A lack is more common with chronic diarrhoea, little meat and pulses, and under cortisone.
Part of the body’s own protection against oxidative stress. The need is covered by Brazil nuts, fish, eggs and offal — more is not better here, and high doses over long periods are not harmless.
Treatment often runs through cortisone, and then bone is the organ that quietly suffers alongside. Vitamin D and calcium belong from the first week if it is foreseeable that it will last longer than three months.
Often recommended in hives because in the test tube it slows the release of histamine. In humans this has never been shown — and here an inflammation of the vessels underlies it anyway, not a pure histamine problem. The difference from ordinary hives is exactly the point.
Effects on inflammation and triglycerides established; cardiovascular prevention is mixed. Watch quality and freshness.
The difference from ordinary hives decides the treatment: here the weal stays beyond 24 hours, burns rather than itches and leaves a brownish mark. Antihistamines are then not enough.
As with other autoimmune situations thyroid antibodies are found more often. The value belongs to the first work-up, together with the kidney and inflammation values.
Unlike ordinary hives this rests on vessel inflammation. A low-histamine diet therefore brings little — clarifying the cause comes first.
Unlike ordinary hives this rests on vessel inflammation. A low-histamine diet therefore brings little — the search for the cause comes first.