May provoke the onset of edema
Urticaria (another name is urticaria) isskin disease, in which itching occurs on individual sites, and later blisters. As mentioned above, the urticaria manifests itself in the form of red areas of the skin, which can be of various sizes, from a few millimeters to several centimeters in diameter. As a rule, during the day after the start of treatment at home, the symptoms disappear. If the rash lasts longer than a couple of days, be sure to consult a doctor. 
Edit Method 1 of 3:
Eliminate provoking factors
Eliminate foods that can provoke the appearance of hives symptoms. Keep a food diary by writing down to it whatyou eat. If necessary, make changes to your diet. Regular records will help you identify illegal products. Products that can cause hives: 
- Products containing vasoactive amines. Some products containing histamine or other vasoactive amines can cause hives. Such products include mollusks, fish, tomatoes, pineapples, strawberries and chocolate.
- Products with salicylates. This substance is similar in its effect to aspirin. Such products include tomatoes, raspberries, orange juice, spices and tea.
- In addition, allergic reaction can cause peanuts, hazelnuts, eggs, cheese and milk.  Some believe that caffeine and alcohol can also cause hives. 
Think about whether something in the environment can cause you an allergic reaction. If so, you can reduce the symptoms of hives, if you avoid contact with provocative elements. Such provocative elements include:   
- Pollen. If your body reacts to the pollen with a rash and blisters, then in your case it is necessary to do everything possible to reduce the ingress of pollen into the body. Try not to go out during flowering, and do not open the windows.
- Dust mites and animal dander. If you are allergic to dust mites, keep your house clean, warn dust. To reduce the manifestation of allergies, try to regularly vacuum, dust and wash things. Change the sheets as often as possible, so as not to sleep on dusty sheets covered with animal dander.
- Latex. In some cases, the cause of the symptoms of urticaria may be contacting the skin with latex. If you are a health worker and you think that latex is the cause of your hives, try wearing gloves without latex. Thanks to this you can understand whether the cause of urticaria is really latex.
Try your best to avoid insect bites.   For some people, a bite of insects is fraught withserious consequences. The most frequent reaction to bites are rashes by the type of urticaria. During the bite of an insect, a substance is injected into the human body, resulting in an allergic reaction. In severe allergic reactions, adrenaline is administered. If you work on the street, reduce the risk of bites:
- Stay away from bee hives and aspensnests. When a large number of bees or wasps appear, it is not necessary to irritate them by any action. Instead, calmly step aside and wait until they fly away.
- Apply insect repellent to clothing andskin. Do not allow the product to come into the nose, eyes, or mouth. And although there is a large selection of insect protection products, use those that contain DETA, as they have proven to be effective agents.
Protect the skin from the negative effects of environmental factors. This means that you should protect the skin fromsharp changes in temperature, until your body adapts to a new climate. Use sunscreen. Some people have such sensitive skin that various environmental factors can cause hives:  
- The sun
- Pressure on the skin
Tell your doctor about what medications you are taking. Some drugs can cause the appearance ofsymptoms of hives.  If it seems to you that the drug you are receiving causes symptoms of hives, do not stop taking it, without consulting your doctor. Your doctor can recommend you other drugs that will not cause you symptoms of hives. Drugs that can cause symptoms of hives: 
- Preparations for the treatment of blood pressure
- Naproxen (Aleve)
- Ibuprofen (Advil, Motrin IB, and others)
Pay attention to your general health. Consult your doctor to determine if hives can be a symptom of a serious illness. Very many diseases are accompanied by a rash. To such diseases it is possible to carry:  
- Bacterial infections
- Intestinal parasites
- Viral infections, including hepatitis, cytomegalovirus, Epstein-Barr virus and HIV
- Thyroid gland diseases
- Diseases of the immune system, such as lupus
- Response to blood transfusion
- Rare genetic disorders that affect the immune system, as well as the level of protein in the blood
Call an ambulance if you experience difficulty breathing. In some cases, a person may experiencedifficulty breathing or feel swelling in the throat when he develops a rash. If this happens to you, you need urgent help, so call an ambulance immediately.  
- If you experience a severe allergic reaction, ambulance doctors will most likely give you a shot of epinephrine. The introduction of epinephrine (adrenaline) helps reduce edema. 
Take antihistamines. These drugs can be purchased at the pharmacy without a prescription. Antihistamines are the most effective medicines that help reduce the symptoms of hives, for example, itching and swelling.  
- The most commonly used are the following antihistaminepreparations: cetirizine, fexofenadine and loratadine. Diphenhydramine (Benadryl) is a widely used antihistamine, but it is sold in the pharmacy only by prescription. 
- Antihistamines cause drowsiness. Be sure to check with your doctor if you can drive the vehicle if you are taking an antihistamine. Do not drink alcohol when taking antihistamines. Read the instructions and follow the manufacturer's instructions and your doctor's recommendations.
- Be sure to tell your doctor if you are pregnant. Antihistamines should not be taken by pregnant women.
Ask your doctor about corticosteroids. These drugs are usually prescribed incase, when antihistamines do not help. Corticosteroids suppress the immune response, which is very important in the treatment of urticaria. As a rule, prescribe treatment with prednisolone for 5-6 days. [thirty]
- Be sure to tell your doctor about your conditionhealth before taking corticosteroids. Tell your doctor if you have high blood pressure, glaucoma, cataracts, or diabetes. If you suffer from one of these diseases, the doctor will not be able to prescribe you corticosteroids. Be sure to tell your doctor if you are breast-feeding or expect to be pregnant.
- Side effects of corticosteroids: weight gain, mood swings and insomnia.
Try additional drugs, if the above does not work. If you can not cure hives, followingthe above tips, consult a dermatologist. Most likely, the doctor will prescribe you additional medications. Be sure to tell your doctor if you are taking any medications, are pregnant or are breast-feeding. 
- Menthol Ointment. Ointment is applied externally to reduce itching.
- Blockers of H2-histamine receptors. Drugs of this group differ from antihistamines, which are sold without a prescription. These drugs help to quickly narrow the blood vessels, reduce swelling and redness. Side effects: headache, diarrhea and dizziness.
- Leukotriene receptor antagonists. These medications the doctor can prescribe instead of corticosteroids, because they have less pronounced side effects. However, sometimes these drugs can cause side effects. However, this happens very rarely. Possible side effects: headache and nausea.
- Cyclosporine. This drug suppresses the immune system. Side effects: high blood pressure, headaches, kidney problems, high cholesterol, tremors and increased vulnerability to infections. This medicine is usually taken within a few months.
Ask your doctor about phototherapy. To treat hives very often usednarrow-band midwave ultraviolet therapy. During the procedure, you will be in a small room for several minutes, where you will be exposed to pulsed light. 
- This method of treatment does not bring quick results. You will need 2 to 5 sessions per week, and you may have to make at least 20 sessions before you see the result.
- However, it should be remembered that this method of treatment can lead to burns, as well as increase the risk of developing skin cancer.
- Consult your doctor beforetake any medication if you are pregnant, breastfeed, or rashes have appeared in your child. Be sure to consult a doctor, regardless of what drugs you are going to take: medicines that are over-the-counter, herbal medicines or food supplements.
- Inform the doctor about the preparations, phytopreparations andadditives that you are currently taking. This is very important, since they can interact with the medicines that the doctor is going to assign to you.
- Follow the advice given in the instructions or advice of your health care provider.