Infections around the fingernails are called paronychia. They are usually caused by picking or biting at dry skin around the nails or by cutting or removing the cuticle from around the nail too enthusiastically. This allows infection to get into the skin around the bed of the fingernail. The infection can be caused by bacteria, yeasts or fungi, depending on the cause of the injury, and the organisms that get into the wound as a result of this.