an unhealthy nail condition that is hereditary or caused by injury or disease of the nail unit

depressions running across the nail plates width due to a slowing production of matrix cells

dark purplish spots usually due to a small nail bed injury

nails turn a variety of colors; may indicate surface staining, a systemic disorder, or poor blood circulation

noticeably thin white nail plate is more flexible than usual

damaged skin around the nail plate (often on the eponychuim) becomes torn or split

whitish discolored spots on the nails

significant nail darkening caused by increased pigment cells

irregular stretching of the eponychium or hyponychium around the nail plate

bitten nails

irregular split or brittle nails appearing as nail plate surface roughness

also known as trumpet nail; a form of dramatically increased nail curvature of the free edge

also known as a folded nail; highly curved nail plate

lengthwise grooves in the plate, often mistaken for ridges

damage to the capillaries under the nail, giving the appearance of a lengthwise small splinter

finger with visible redness, pain, swelling skin or pus

also known as subungual melanoma, a rare and serious type of skin cancer

nail surface pitting, roughness, onycholysis

matrix inflammation and nail shedding caused by infection or injury

ingrown nail

separation of the nail plate and bed often due to injury or allergic reaction

separation and falling off of a nail plate from the nail bed

nail plate fungal infection

bacterial inflammation of the tissues around the nail plate

rapidly growing and contagious bacteria can cause infection; seen in the early stages as yellow-green spot that becomes darker in its advanced stages

severe nail inflammation, in which a lump of red tissue grows up from the nail bed to the nail plate

medical term for fungal infection of the feet, also known as athletes foot.