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.
Retro-cochlear disease, such as acoustic neuroma, may cause a senstion of plugged ear. Patients may say plugged ears, fulness in the ears, clogged ears, obstructed ears, blockade of ears, pain in the ear, lock in the ear, barricade in the ear, mass in the ear, obstacle in the ear, occulsion in the ear, ear arrest, ear shut off, closure of the ear.