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.
First, make sure your ears are not clogged because of wax build up. Wax build up can happen anytime and pregnancy wouldn't be the cause. Do not attempt to use a Q-Tip to take out the wax, this will only push the wax further. Use instead ear wax removal products.