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 drops for clogged ears. If your plugged ears are from cold, allergies, clogged wax, among other causes, there are a number of ear drops you can give a try. You will get these ear drops in your local pharmaceutical stores, at Walgreens, Walmart, CVS, and other leading pharmaceutical companies.