Hives Treatment in San Francisco, CA

If you’re breaking out in itchy, raised welts that appear without warning and disappear just as quickly, you may be dealing with hives. At SH Allergy, Asthma & Immunology, our board-certified allergists have extensive experience diagnosing and treating both acute and chronic hives across our San Francisco, Marin, and San Mateo locations. Whether your hives flare up occasionally or have persisted for months, we can help you find lasting relief.

What Are Hives?

Hives medically known as urticaria are raised, red or skin-colored welts that appear on the surface of the skin. They are intensely itchy, can range in size from a small spot to a large blotchy patch, and typically resolve within 24 hours without leaving a scar. They can appear anywhere on the body and often come and go unpredictably.

Hives are extremely common. Research estimates that about 20% of people will experience at least one episode in their lifetime. For some, a single outbreak resolves quickly and never returns. For others, hives become a recurring or persistent condition that significantly disrupts sleep, work, and daily life.

Hives and Angioedema: Understanding the Connection

Angioedema is a related condition that often occurs alongside hives. Where hives affect the surface of the skin, angioedema involves deeper swelling beneath the skin most commonly in the face, lips, throat, hands, and feet. Throat swelling associated with angioedema can be life-threatening and requires immediate emergency care. If you experience hives along with swelling of the mouth or throat, call 911 or go to your nearest emergency room immediately.

Acute vs. Chronic Hives: What’s the Difference?

Not all hives are the same. The duration and pattern of your outbreaks plays a major role in how your allergist will investigate and treat them.

Acute Hives

Acute hives last less than six weeks. They are usually triggered by a specific and identifiable cause an allergic reaction to a food, medication, insect sting, or a viral infection. Once the trigger is removed or the infection clears, acute hives typically resolve on their own. Antihistamines are usually effective at managing symptoms during this period.

Chronic Hives

Chronic hives last longer than six weeks, and in some cases persist for months or years. They tend to recur unpredictably and can be significantly harder to manage. Patients with chronic hives often cycle through multiple over-the-counter remedies without adequate relief, which is the point at which seeing a specialist becomes essential.

Chronic Spontaneous Urticaria (CSU)

Chronic spontaneous urticaria is a subtype of chronic hives in which no external trigger can be identified. Rather than coming from an outside allergen, CSU appears to involve an abnormal immune response within the skin itself. It is one of the more challenging forms of hives to treat, but there are now highly effective prescription options including biologic medications that can bring CSU under control even when standard antihistamines have failed. Our allergists are experienced in evaluating and managing CSU and will work with you to find the right treatment approach.

What Causes Hives?

Hives develop when the body releases histamine and other chemicals in response to a perceived threat. That trigger can be allergic, non-allergic, or in many chronic cases, entirely unknown.

Common Allergic Triggers

Foods, particularly peanuts, tree nuts, shellfish, eggs, and milk
Medications, including penicillin, aspirin, and NSAIDs
Insect stings and bites
Latex
Pet dander and animal saliva
Pollen and environmental allergens

Non-Allergic Triggers

Physical stimuli such as pressure, heat, cold, or exercise
Viral or bacterial infections
Emotional stress
Alcohol
Scratching or rubbing the skin (a condition called dermatographism)

When No Cause Can Be Found

One of the most important things to understand about chronic hives is that a food allergy is rarely the cause. Many patients arrive at our clinic convinced that something in their diet is responsible, but research consistently shows that for the vast majority of people with chronic spontaneous urticaria, food is not the trigger. This does not mean your hives are not real or treatable it simply means that a thorough clinical workup, rather than dietary elimination alone, is the most effective path to identifying what is driving them.

Symptoms of Hives

Hives typically present as:

Raised, red, pink, or skin-colored welts or bumps on the skin
Intense itching, sometimes accompanied by a burning or stinging sensation
Welts that change shape, migrate to different areas of the body, or fade and reappear
Individual lesions that resolve within 24 hours, even if new ones continue to form
Swelling of the lips, eyelids, or other areas (angioedema)

When to Seek Emergency Care

Hives are usually uncomfortable but not dangerous. However, they can occasionally be a sign of a severe allergic reaction. Seek emergency care immediately if your hives are accompanied by:

Swelling of the tongue, lips, or throat
Difficulty breathing or shortness of breath
Dizziness, lightheadedness, or fainting
Nausea, vomiting, or a sudden drop in blood pressure

These are warning signs of anaphylaxis, a potentially life-threatening reaction that requires immediate treatment with epinephrine.

How Our Allergists Diagnose Hives

Getting an accurate diagnosis is the foundation of effective hives treatment. A general description of “itchy bumps” can apply to many skin conditions our allergists are trained to distinguish urticaria from eczema, contact dermatitis, psoriasis, and other conditions that can look similar at first glance.

Medical History and Physical Exam

Your appointment will begin with a thorough review of your medical history. Your allergist will ask detailed questions about when your hives first appeared, how long each outbreak lasts, where on the body they occur, what makes them better or worse, any recent illnesses or new medications, and your family history of allergies or autoimmune conditions. This history is often the most valuable diagnostic tool available.

Allergy Testing for Hives

If an allergic trigger is suspected, your allergist may recommend skin prick testing or specific IgE blood testing to identify potential allergens. Testing helps confirm whether a food, medication, or environmental allergen is driving your outbreaks and just as importantly, helps rule out triggers that patients often assume are responsible but are not.

Testing for Chronic Hives

For patients with chronic hives, additional laboratory testing may be ordered to look for underlying autoimmune activity, thyroid dysfunction, or other systemic conditions that can drive persistent urticaria. In some cases, a skin biopsy may be recommended if the presentation is unusual. Your allergist will interpret these results in context and explain what they mean for your treatment plan.

Hives Treatment Options

There is no single treatment that works for every patient. The right approach depends on whether your hives are acute or chronic, their likely cause, and how much they are affecting your quality of life. Our allergists will develop a personalized treatment plan tailored to your specific situation.

Antihistamines

Antihistamines are the first-line treatment for most cases of hives. They work by blocking histamine receptors in the skin, reducing itching and the formation of new welts. Non-sedating antihistamines such as cetirizine, loratadine, and fexofenadine are preferred because they are effective, long-lasting, and have fewer side effects. Your allergist may recommend taking a combination of two or three antihistamines for better control, and in some cases higher doses than the standard over-the-counter amount may be appropriate.

Corticosteroids

For severe acute flares, a short course of oral corticosteroids such as prednisone may be prescribed to quickly reduce inflammation and bring symptoms under control. Corticosteroids are not intended for long-term use due to their side effect profile, but they can be an important short-term tool when hives are severe or rapidly worsening.

Xolair (Omalizumab) for Chronic Hives

Xolair (omalizumab) is a biologic injection approved for the treatment of chronic spontaneous urticaria in patients aged 12 and older whose symptoms are not adequately controlled by antihistamines. It is administered once a month by injection in our office and works by targeting IgE, a key molecule in the allergic response. Many patients who have tried multiple antihistamines without success experience significant improvement or complete remission with Xolair. If you have been living with chronic hives that have not responded to standard treatment, this may be the option that finally provides relief.

Biologics and Immune Modulators

For patients who do not respond to antihistamines or Xolair, additional treatment options exist. These include leukotriene antagonists, cyclosporine, hydroxychloroquine, dapsone, and other immune-modulating medications. Because these treatments carry potential side effects and require careful monitoring, they should be managed by a specialist with experience in treating chronic urticaria. Our allergists are familiar with the full spectrum of these options and will discuss the benefits and risks with you in detail.

Trigger Avoidance and Lifestyle Management

Where a trigger can be identified, avoiding it is the most direct way to reduce outbreaks. Your allergist will provide guidance on recognizing and managing your specific triggers whether that means adjusting your diet, switching medications, or modifying certain activities. For patients with physical urticaria triggered by heat, cold, or pressure, practical lifestyle strategies can meaningfully reduce the frequency and severity of flares alongside medical treatment.

Why See an Allergist for Hives?

Primary care doctors can treat straightforward cases of acute hives, but chronic or recurring hives warrant the attention of a specialist. Allergists and immunologists have advanced training in the mechanisms behind urticaria, the full range of available treatments, and the diagnostic tools needed to identify underlying causes that a general practitioner may not investigate.

At SH Allergy, Asthma & Immunology, our physicians are board-certified by the American Board of Allergy and Immunology and have deep experience managing both simple and complex cases of urticaria. We treat patients of all ages from children experiencing their first hives outbreak to adults who have been struggling with chronic urticaria for years without a clear answer. Our goal is not just to suppress your symptoms, but to understand what is driving them and give you the best possible long-term outcome.