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.
Unplug ears that are clogged due to a cold. Colds can often lead to sinus congestion, which in turn, block your eustachian tubesâwhich are connected to your middle ear and the back of your nose. When this gets stopped up, it can lead to a great deal of pain. Ad. 2. Do the Valsalva Maneuver.