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.
This causes the ear to fill up with bloody fluid and after a period of time the blood in the ear clots and there is a firm swelling. If left untreated the ear will be painful and will eventually scar down, similar in appearance to a cauliflower ear in a prized fighter that has spent a lifetime in the boxing ring.