Itchy, raised welts that appear out of nowhere, move from the arms to the back to the face within hours, and then vanish without a trace, only to return the next evening. Hives (urticaria, often called “sheetpitti”) are one of the most common reasons people come to a dermatologist, and one of the most misunderstood. Many people spend months avoiding foods, trying home remedies or taking steroid injections, when a simple, steady plan would keep them comfortable.
What hives are
Deep in the skin sit mast cells, the skin’s alarm cells. When they are switched on, they release histamine and other chemicals. These make the tiny blood vessels nearby leak fluid into the skin, which rises as a wheal: a pale or pink, raised, very itchy swelling with a red flare around it.
Two features set hives apart from other rashes:
- Each welt fades within 24 hours, usually much sooner, and leaves no mark. New ones may appear elsewhere.
- They itch, sometimes intensely, and are often worse in the evening and at night.
Some people also get angioedema: deeper swelling of the lips, eyelids, hands or feet that feels tight or painful rather than itchy and can take up to three days to settle.
Acute or chronic: the six-week line
Dermatologists divide hives by how long they have been coming:
- Acute urticaria lasts less than six weeks. It is very common and usually settles on its own with treatment.
- Chronic urticaria keeps returning for six weeks or more. It affects adults more than children and women more than men, and it is the type that most needs a dermatologist’s plan.
The difference matters, because the causes, the tests and the treatment are different.
Common triggers of a short bout
- Viral infections: colds, sore throats and stomach bugs are the most common trigger, especially in children.
- Medicines: painkillers such as aspirin, ibuprofen and diclofenac, and some antibiotics.
- Foods: less often than people expect. A true food reaction usually starts within minutes to two hours of eating the same food each time.
- Insect stings and bites.
Often no trigger is found, and that’s normal.
Chronic hives: not usually an allergy
The single most useful thing to know about chronic hives is that in most people they are not an allergy to food. In chronic spontaneous urticaria, the immune system itself switches on the skin’s mast cells, so welts come up without any outside trigger. That’s why strict diets rarely help, and why people can eat the same meal on good days and bad days.
Some things can worsen chronic hives without causing them: painkillers like aspirin and ibuprofen, alcohol, stress, infections, heat and tight clothing.
Hives with a physical trigger
In some people, hives are switched on by something physical. These are called inducible urticarias:
- Scratch hives (dermographism): firm stroking or scratching raises itchy lines exactly where the skin was touched.
- Heat and sweat hives (cholinergic urticaria): many small, very itchy bumps with exercise, a hot bath, spicy food or stress. Rajkot’s long summers make this one common.
- Pressure hives: deep, painful swelling hours after pressure from a bag strap, tight waistband or long standing.
- Cold hives: welts after cold water, an air-conditioned room or a cold drink. Swimming in cold water can be dangerous for people with this type, so ask your doctor first.
- Sun hives: welts on sun-exposed skin within minutes outdoors.
Which tests help?
For a short bout, usually no tests are needed. For chronic hives, international and Indian guidelines advise a limited set of tests guided by your history, not a large allergy panel. A dermatologist will ask what you were doing, eating and taking when welts appeared, look at the pattern, sometimes do a simple test such as stroking the skin, and may order a few basic blood tests (a blood count, an inflammation marker and sometimes thyroid antibodies).
Keep a hives diary: for two weeks, note when welts appear, roughly how many, what you ate, any medicines, exercise, heat or pressure, and take photos on your phone. It is more useful than most tests.
How hives are treated
The aim is simple: no hives, no itch, a normal day and a full night’s sleep.
- A non-drowsy antihistamine, taken every day. Modern antihistamines are the first step. For chronic hives they work best taken regularly, not only when welts appear.
- A higher dose if needed. If hives continue after two to four weeks, guidelines allow a dermatologist to raise the dose, up to four times the standard one. This is done under medical guidance, not on your own.
- Newer treatments when antihistamines aren’t enough. For hives that still don’t settle, a dermatologist may add a monthly injection that blocks the immune pathway behind them (omalizumab) or a medicine that calms the immune system (ciclosporin), with regular monitoring.
- Steroids only for a short, severe flare. Repeated steroid injections or long courses of tablets don’t cure hives and carry real side effects. Older, drowsy antihistamines are also best avoided for daily use.
Once hives have been controlled for a while, the dose is reduced slowly. Chronic hives often last months to a few years and then settle on their own; treatment keeps life normal until they do.
Simple measures that help the itch
- Take lukewarm, not hot, showers, and pat the skin dry.
- Wear loose, soft cotton clothes; avoid tight waistbands and heavy bag straps if pressure triggers you.
- A cool compress or calamine lotion soothes a bad patch.
- If painkillers make your hives worse, ask your doctor which one to use instead.
- Keep the bedroom cool, as heat makes the itch worse at night.
- Don’t start elimination diets without a clear food link; they rarely help chronic hives.
When to get help
Go to an emergency department or call 108 straight away if hives come with:
- swelling of the tongue, lips or throat, or a hoarse voice;
- difficulty breathing, wheezing or a tight chest;
- feeling faint or dizzy, or vomiting after a sting, a medicine or a food.
These can be signs of anaphylaxis, a severe allergic reaction.
See a dermatologist if:
- hives have been coming back for more than a few weeks;
- you get swelling of the face, lips or eyes even without welts. If you take a blood pressure medicine from the ACE-inhibitor group, tell your doctor, as it can cause this kind of swelling;
- welts last longer than a day, leave bruises or marks, burn rather than itch, or come with fever or joint pain. These point to a different condition that needs checking;
- the itch is stopping you from sleeping or working, or you are relying on repeated steroid injections.
At OrnaSkin Madhur Nagar, Dr. Smit Thakkar sees people with hives and other itchy rashes by appointment. Our page on consulting a skin specialist in Rajkot explains how a consultation works.
The short version
Hives are itchy welts that fade within a day. Short bouts usually follow an infection, a medicine or occasionally a food; hives that keep coming back for six weeks or more are rarely a food allergy. A daily non-drowsy antihistamine, adjusted by a dermatologist, controls most cases, and newer treatments help when it isn’t enough. Swelling of the tongue or throat, or trouble breathing, is an emergency.
