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.
1. Get help from a doctor now âº. Stuffy, clogged ears: It is not uncommon for ears to feel stuffy and clogged when allergies flare up, when you experience a change in altitude or during the course of a cold. Sometimes this can happen as an ear infection evolves. This is from dysfunction of the eustachian tube.