Clean the area with soap and water for at least 10 minutes. Take a cool bath. Apply calamine or another anti-itching lotion three to four times a day to relieve itching. Soothe inflamed areas with oatmeal products or 1 percent hydrocortisone cream.

They may take a few hours to a few days to disappear. If the exposure to the allergen continues, such as during a spring pollen season, allergic reactions may last for longer periods such as a few weeks to months. Even with adequate treatment, some allergic reactions may take two to four weeks to go away.

Skin allergy symptoms often go away on their own in a week or two, but treatment may make you more comfortable in the meantime. If you have serious symptoms like trouble breathing or swelling in your throat, they could be signs of a life-threatening reaction called anaphylaxis. Call 911 right away.

Common allergy triggers include: Airborne allergens, such as pollen, animal dander, dust mites and mold. Certain foods, particularly peanuts, tree nuts, wheat, soy, fish, shellfish, eggs and milk. Insect stings, such as from a bee or wasp.

Here are some relief measures to try, along with information about why they might work.

1. Cold compress. One of the fastest and easiest ways to stop the pain and itch of a rash is to apply cold.
2. Oatmeal bath.
3. Aloe vera (fresh)
4. Coconut oil.
5. Tea tree oil.
6. Baking soda.
7. Indigo naturalis.
8. Apple cider vinegar.

The most common signs and symptoms of an allergic reaction include: Cough, difficulty or irregular breathing, wheezing, itchy throat or mouth, and difficulty swallowing. Nausea, vomiting, abdominal pain, and diarrhea. Itchiness, red bumps or welts on the skin (hives), and skin redness.

Anaphylaxis is a severe, potentially life-threatening allergic reaction. It can occur within seconds or minutes of exposure to something you’re allergic to, such as peanuts or bee stings.

One treatment that is often prescribed for food allergies—as well as for those caused by insects, medications and latex—is an epinephrine injection. This is a prefilled, pen-sized device containing liquid medication that works to relax the muscles of the airway at the first sign of a serious allergic reaction.

Your immune system overreacts by producing antibodies called Immunoglobulin E (IgE). These antibodies travel to cells that release chemicals, causing an allergic reaction. This reaction usually causes symptoms in the nose, lungs, throat, sinuses, ears, lining of the stomach or on the skin.

With early and appropriate treatment, cases of anaphylaxis can improve quickly within a few hours. If a person has already developed the more serious symptoms and dangerous conditions, it may take a few days to fully recover after treatment. If untreated, anaphylaxis can cause death within minutes to hours.