Matching Pairs Nail DisordersOnline version Match the nail disorder to the correct nail disorder description. by Rosalind Carter 1 bruised nail beds 2 hang nail 3 ridges 4 splinter hemorrhage 5 melanonychia 6 onychauxis Perfectly normal in older clients. Caused by physical trauma or injury to the nail bed that damages capillaries and allows small amounts of blood flow. Darkening of the fingernails or toenails. Treated by trimming or bringing the nails down to size. Condition in which a blood clot forms under the nail plate, causing a dark purplish spot. Condition in which the living skin around the nail plate splits and tears.