If an individual has characteristics of perfectionism, this does not mean they think they are perfect. In actuality, it is quite the opposite.

Obsessive Compulsive Disorder (OCD) is a condition that involves intrusive thoughts, images, or bodily sensations that cause an uncomfortable emotion (e.g., anxiety, guilt, shame, etc..), which leads one to engage in compulsive behavior (e.g., mental, behavioral) to alleviate that uncomfortable emotion.