Yellow Macular Lesions
- Jaundice, also known as icterus (attributive adjective: "icteric"), is yellowish discoloration of the skin, conjunctiva (a clear covering over the sclera, or whites of the eyes) and mucous membranes caused by hyperbilirubinemia (increased levels of bilirubin in red blooded animals). Usually the concentration of bilirubin in the blood must exceed 2–3 mg/dL for the coloration to be easily visible. Jaundice comes from the French word jaune, meaning yellow. Jaundice typically appears in a 'top to bottom' progression (starting with the face, progressing toward the feet), and resolves in a 'bottom to top' manner.
· Xanthomata (plantar - plantar)
· Xanthelasma (sometimes paplable)
- Carotenemia. Carotenemia is a common finding in children, mainly due to the excessive intake of carrots, but it can also be associated with the ingestion of many other yellow and green vegetables and citrus fruits. Carotene is a lipochrome that normally adds yellow color to the skin. With elevated blood levels of carotene, the prominence of this yellowing is increased. Carotenemia may be particularly evident when the stratum corneum is thickened or when the subcutaneous fat is strongly represented. The condition of carotenemia is harmless, but it can lead to a mistaken diagnosis of jaundice.
· Pseudoxanthoma elasticum is a serious heredilary of connective tissue that involves the elastic tissue in the skin, blood vessels, and eyes.
· Necrobiosis lipoidica diabeticorum
· Amyloidosis (primary)
- Fordyce condition. Sebaceous hyperplasia is a skin condition in which a person develops small, yellowish growths, usually on the face. A variant of this condition, known as Fordyce’s condition causes tiny yellow dots in groups and sometimes in sheets on the lips, inside the mouth, and sometimes on the genital skin. In both conditions, the small, yellow spots represent an overgrowth of sebaceous glands. Neither sebaceous hyperplasia or Fordyce’s condition is dangerous. Causes:
- The cause is unknown.
- These problems tend to run in families.
- Neither sebaceous hyperplasia or Fordyce’s condition is contagious.
· Solar elastosis
Date: 2015-01-11; view: 99