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Hives: Causes, Symptoms, and What to Do If the Rash Doesn't Go Away
Skin redness, itching, and sudden blisters that look like a nettle burn — sound familiar? If so, you may have experienced hives, an allergic reaction that can occur at any age and for a variety of reasons. It often comes on suddenly, causing severe discomfort and even panic, especially when the rash spreads throughout the body or is accompanied by swelling.
Hives are not just a rash, they are a sign that the body is responding to a stimulus or internal imbalance. Sometimes it goes away on its own, and sometimes it becomes chronic, requiring careful diagnosis and long-term treatment.
What is hives?
Hives (urticaria) is allergic or pseudoallergic reaction, which appears as red or pink blisters that are raised above the skin and are accompanied by severe itching. The rash usually disappears within 24 hours, but new elements may appear.
Blisters are formed due to the release of histamine and other mediators from skin cells, which dilate blood vessels and cause swelling of the dermis.
Causes of occurrence
Hives can be sharp (up to 6 weeks) or chronic (over 6 weeks). The main causes include:
Food allergens: nuts, seafood, milk, eggs, strawberries
Medicine: antibiotics, NSAIDs, anticonvulsants
Infections: SARS, bacterial and viral infections
Contact with irritants: chemicals, latex, wool
Physical factors: cold, heat, pressure, sunlight
Psycho-emotional stress, hormonal changes
Systemic diseases: autoimmune, endocrine disorders
Idiopathic cases, when the cause is not found
Forms of urticaria: classification
| Type | Features | Provoking factor |
|---|---|---|
| Acute | Sudden onset, lasts up to 6 weeks | Allergies to food, medications, infections |
| Chronic | Rashes appear daily or intermittently for more than 6 weeks | Autoimmune or undiagnosed causes |
| Cold | Rash after exposure to cold | Contact with cold water, air |
| Sunny | Reaction to ultraviolet light | Sunlight |
| Dermographic | Linear pressure marks on the skin | Scratches, tight clothing |
| Contact | Rash at the site of contact | Chemistry, latex, cosmetics |
Symptoms
pinkish-red blisters on the skin
itching, sometimes very intense
merging of blisters into large areas
possible swelling of the lips, eyelids, hands
in severe cases - Quincke's edema (angioedema), which requires immediate help
The rash most often appears on the trunk, arms, legs, and face. Symptoms may be more severe in children.
Diagnostics
To determine the cause and rule out other conditions, the following are performed:
complete blood count, C-reactive protein
analysis for total and specific IgE
skin tests with allergens
examination of thyroid, liver, and gastrointestinal tract functions
provocative tests — if the physical form of urticaria is suspected
examination by an allergist or dermatologist
Treatment
Main approaches:
Antihistamines of the 2nd–3rd generation — loratadine, cetirizine, fexofenadine
Avoiding contact with the allergen or trigger
Glucocorticoids — short course for severe cases
Systemic therapy (omalizumab, cyclosporine) — for chronic urticaria that is not controllable
Probiotics, enzymes, sanitation of foci of chronic infection — as supporting measures
In children, treatment usually includes diet, sorbents, and mild antihistamines.
Hives are not just a skin rash, but a mirror of the body's immune system. In most cases, they can be controlled if the cause is correctly identified. You should not tolerate itching and self-medicate - a consultation with an allergist or dermatologist will help not only relieve symptoms, but also avoid complications in the future.
