An intracutaneous test involves injecting the allergen into the skin, frequently deeper than a scratch test. It's preferred when looking for allergies to bee or wasp venom and certain antibiotics like penicillin. ... read more
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They have a whole lot functions, however one of the primary ones is to patrol the blood and lymphatic fluid looking for foreign substances. Every cell in our bodies has a genetic 'signature' that is unique to us. Anything, like a bacteria or virus, that has a different signature is seen seeing as a foreign substance and a candidate for removal. "To do that, white blood cells move to an area where the foreign substance is found. In the case of an allergen, those are usually proteins such as pollen or those stumbled upon in certain foods like milk or peanuts. The white blood cells then cause the release of histamines and enzymes into the surrounding fluid to envelop the foreign protein."

Keeping the windows closed can help, while it prevents the pollen grains from wafting in through the screens. Air conditioners fitted with good filters are preferable to window or attic fans for cooling. Drying clothes outdoors leads to enlarged pollen indoors, from the time when the grains secure attached to the clothing which then may come into close contact with the nose and mouth. Topical 1% hydrocortisone creams are 1 very common and effective over the counter treatment. This solution does profession for millions. Gentle application and proper clothing to avoid wearing it off rapidly can provide symptomatic and even long-term relief. Nevertheless when that is not enough, drugs can help.
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