I had a toe nail injury where the nail is partly off...I noticed the skin under the nail has changed colors and it itches. Is this normal?

Nail Trauma. After an injury to the nail and nail bed, a portal of entry may occur. Bacteria, fungus, yeast may enter. You may be developing an infection on the nail bed. Have a podiatrist or dermatologist culture the nail bed to determine what orgainism may be present, and treat appropriately.