Skin Picking Disorder (Excoriation Disorder/SPD) causes those who suffer from it to continually rub, touch, scratch or pick at their skin. This may be done in an attempt to remove minute irregularities or imperfections. The action may leave a scar and can even cause tissue damage or worse. These actions may occur as an attempt to eliminate feelings of fear or anxiety. People may spend several hours picking at their hair or skin.