Psoriasis is commonly found in the ears too. Ear Psoriasis can appear as dry flaky patches in the ear canal. Psoriasis can cause scale buildup that blocks the ear canal. This scaling can result in the blockage of the ear canal affecting hearing. Psoriasis rarely affects the eardrum. Ear psoriasis is usually found in the external ear canal, not inside the ear or behind the eardrum. Psoriasis of the ears occurs in approximately 18 percent of all patients at some time.