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A nail is a protective plate characteristically found at the tip of the digits ( fingers and toes) of all primates, corresponding to the claws in other tetrapod animals. Fingernails and toenails are made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves and horns of vertebrates.
Cyanosis is the change of body tissue color to a bluish-purple hue, as a result of decrease in the amount of oxygen bound to the hemoglobin in the red blood cells of the capillary bed. Cyanosis is apparent usually in the body tissues covered with thin skin, including the mucous membranes, lips, nail beds, and ear lobes.
Onychomycosis, also known as tinea unguium, [4] is a fungal infection of the nail. [2] Symptoms may include white or yellow nail discoloration, thickening of the nail, and separation of the nail from the nail bed. [2] Fingernails may be affected, but it is more common for toenails. [3] Complications may include cellulitis of the lower leg. [3]
Lichen planus ( LP) is a chronic inflammatory and autoimmune disease that affects the skin, nails, hair, and mucous membranes. [1] [2] It is not an actual lichen, but is named for its appearance. [3] It is characterized by polygonal, flat-topped, violaceous papules and plaques with overlying, reticulated, fine white scale ( Wickham's striae ...
Chevron nail (herringbone nail) Chromhidrosis (colored sweat) Chronic paronychia; Cicatricial alopecia; Clubbing (drumstick fingers, Hippocratic fingers, watch-glass nails) Congenital onychodysplasia of the index fingers; Disseminate and recurrent infundibulofolliculitis; Erosive pustular dermatitis of the scalp (erosive pustular dermatosis of ...
Porphyria is a group of disorders in which substances called porphyrins build up in the body, adversely affecting the skin or nervous system. [1] The types that affect the nervous system are also known as acute porphyria, as symptoms are rapid in onset and short in duration. [1] Symptoms of an attack include abdominal pain, chest pain, vomiting ...
A form of social grooming among birds, in which one bird preens another or a pair does so mutually. At times it may be used to redirect or sublimate aggression, such as one bird assuming a solicitation posture to indicate its non-aggression and invite allopreening by the aggressive individual. [9] alternate plumage.
Purpura (/ ˈ p ɜːr p jʊər ə /) is a condition of red or purple discolored spots on the skin that do not blanch on applying pressure. The spots are caused by bleeding underneath the skin secondary to platelet disorders, vascular disorders, coagulation disorders, or other causes. [2]
Nail polish (also known as nail varnish in British English or nail enamel) is a lacquer that can be applied to the human fingernail or toenails to decorate and protect the nail plates. The formula has been revised repeatedly to enhance its decorative properties, to be safer for the consumer to use, and to suppress cracking or peeling.
Muehrcke's nails or Muehrcke's lines (apparent leukonychia striata) are changes in the fingernail that may be a sign of an underlying medical condition. The term refers to a set of one or more pale transverse bands extending all the way across the nail, parallel to the lunula.