Hi,
Allergies are your body's way of reacting to perceived threats in your environment. When the body is exposed to a substance you are allergic to, called a trigger or allergen, your immune system tries to fight off the assault by producing an antibody called immunoglobulin E (IgE). The problem is, these antibodies cause your cells to release proteins called histamines, which in turn can cause itching, swelling, runny eyes or nose.
There are hundreds of different allergy triggers, but the most common ones include pollens, molds, dust mites (tiny creatures that live in household dust), animal dander, and industrial chemicals.
If your allergies seem to flare up at specific times, most commonly in the spring, then you probably have hay fever, in which case pollen is responsible.
ref:http://www.myonlinewellness.com/topic/allergy
Hi
Have you tried taking antihistamine or corticosteroids for the skin condition? If yes, was the skin condition relieved?
The cause of the swelling may be due to an allergic reaction to an unknown trigger. If there are no known allergies, then blood tests to determine the presence of infections may be done. Fever, joint pains and rash may indicate an underlying infectious process. I suggest that you have this assessed by your doctor. For inflammatory conditions, corticosteroids are usually prescribed to help alleviate the swelling or inflammation. Always inform your doctor before taking any medications.