1 Poison ivy, poison oak, and poison sumac are plants than can cause an itchy rash upon contact. 2  A substance called urushiol, found in these plants, causes the rash. 3  The rash is not contagious.  The rash usually disappears in one to three weeks.
Common factors that can cause clogged ears are wax buildup, air flow blockage to the Eustachian tubes, pressure differences in the middle ear, and cold and sinus problems. Clogged ears can affect people of all ages, but is most common among children, especially when they have colds.
What causes ear fullness? Ear fullness can be caused by infection, especially when accompanied by cold and flu-like symptoms. The feeling of fullness is the result a blocked Eustachian tube, which connects your ear to your throat and permits the drainage of fluid from your middle ear. If fluid builds up, the middle ear may become infected with bacteria or viruses, leading to pain and swelling.