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.
How to Unplug Ears. Has your hearing become suddenly worse, and you feel like somebody stuffed cotton in your ears? Several factors cause plugged ears: wax buildup, air flow blockage to the Eustachian tubes, pressure differences in the middle ear, colds and sinus illnessâall can cause your hearing to become muffled. Plugged ears can even be quite painful, as seen (and heard) with babies on airplanes.