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.
Ear fullness is the feeling that your ears are clogged, stuffed or congested when yawning, swallowing, or other usual methods for eliminating this sensation have failed to work. You may experience muffled or slightly impaired hearing as a result. Ear fullness accompanied by cold and flu-like symptoms is typically caused by 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, it can cause the middle ear to become infected with bacteria or viruses, causing pain and swelling.