1 Henoch-Schonlein purpura. 2  This condition is an inflammation of the smallest blood vessels (capillaries) of your skin, joints, bowel and kidneys. 3  Signs and symptoms include abdominal pain, blood in the urine, joint pain, and a rash on your buttocks or lower legs.
Allergic rhinitis, also known as hay fever, is a type of inflammation in the nose which occurs when the immune system overreacts to allergens in the air. Signs and symptoms include a runny or stuffy nose, sneezing, red, itchy, and watery eyes, and swelling around the eyes. The fluid from the nose is usually clear.
Persistent allergic rhinitis. The most common cause of persistent rhinitis is an allergy to the house dust mite. However, allergy to pets or other animals is also common. Note: the thing that causes an allergy (house dust mite, dead animal skin, etc) is often known as the allergen.