Piercing your ears or other body parts could bring on sickness, diseases, and other problems (by the demons). Bell's Palsy and sexual problems are two known problems, as reported from other Deliverance ministries and this email -

"Regarding your article on pierced earrings, I am living proof that this opens you up to bells palsy. I just recovered from bells palsy. I got BP because of wearing pierced earrings. Needless to say, I destroyed all of my pierced earrings. Please continue to warn others."

This also pertains to tattoos, needles, knives, razor blades, and anything that pierces the skin.

According to Bible History, the only people who had pierced ears/nose were sorcerers, prostitutes, and slaves. Because of this origin, you should not pierce your skin.