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Letting them go untreated, however, can make them more severe and harder to treat in the long run. ... Also, colds usually last seven to 10 days, whereas allergy symptoms can persist for much longer.
Allergies last as long as you are exposed to the allergen. In the case of spring allergies, this can be months. Even though you can get a cough with an allergy, it is more often a sign of a cold.
Unlike most food allergies, in some people, the alpha-gal allergy may recede over time as long as another tick does not bite the person. It has been found that with avoidance of further tick bites, levels of serum IgE decline. [8] The recovery period can take 8 months to 5 years. [6] [22] [9]
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Skin allergies frequently cause rashes, or swelling and inflammation within the skin, in what is known as a "weal and flare" reaction characteristic of hives and angioedema. [30] With insect stings, a large local reaction may occur in the form of an area of skin redness greater than 10 cm in size that can last one to two days. [31]
The rash appears immediately in irritant contact dermatitis; in allergic contact dermatitis, the rash sometimes does not appear until 24–72 hours after exposure to the allergen. Blisters or wheals: Blisters, wheals (welts), and urticaria (hives) often form in a pattern where skin was directly exposed to the allergen or irritant.
These symptoms usually last longer than 7–10 days. Among seasonal allergies, there are some allergens that fuse together and produce a new type of allergy. For instance, grass pollen allergens cross-react with food allergy proteins in vegetables such as onion, lettuce, carrots, celery, and corn.
Treating allergy symptoms with over-the-counter medication, saline spray, and, if warranted, allergy medication or injections from your doctor, may also help reduce GI symptoms as a result.
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