What causes demarcation lines?
PDL are abrupt transition lines from areas of deeper pigmentation to areas with less pigmentation. The exact cause is unknown, but Type B lines, as seen with our patient, tend to appear during pregnancy on the lower limbs, and regress after delivery.
What is demarcation of the skin?
Pigmentary demarcation lines (PDL) are areas of an abrupt transition from hyper- to hypo-pigmented or normal skin colour. They can be seen on the limbs, face, and sometimes the trunk.
Can pigmentary demarcation lines be treated?
Pigmentary demarcation line in pregnancy may regress spontaneously after delivery and does not require treatment. Facial PDL has a persistent course posing cosmetic concern for the patient and a challenge for dermatologist.
What is pigmentary demarcation?
Pigmentary demarcation lines, also known as Futcher or Voigt lines, are abrupt transitions between areas of darker and lighter pigmentation. They are most commonly found on the extremities and the trunk. Pigmentary demarcation lines were first described by Matsumoto in a case series of Japanese women in 1913.
What is the meaning of demarcation line?
(laɪn əv ˌdiːmɑːˈkeɪʃən) noun. a separation between things deemed to be distinct.
What are examples of demarcation?
Demarcation definition An example of a demarcation is a city limit sign. An example of a demarcation is drawing an out of bounds line for a baseball field. The act of marking off a boundary or setting a limit, notably by belligerents signing a treaty or ceasefire. A limit thus fixed, in full demarcation line.
Where is the demarcation line?
Americas. The Line of Demarcation was one specific line drawn along a meridian in the Atlantic Ocean as part of the Treaty of Tordesillas in 1494 to divide new lands claimed by Portugal from those of Spain. This line was drawn in 1493 after Christopher Columbus returned from his maiden voyage to the Americas.
What are pigment demarcation lines?
Pigmentary (Pigment means color) demarcation lines or PDLs. , also known as Futcher’s lines or Voigt’s lines, are physiological (natural) abrupt transition lines from areas of deeper skin color to areas with lighter color . These are sharp demarcation lines that occur on different parts of the body.
What is the line of demarcation?
the Line of Demarcation is a “line” dividing the non-European world in two zones. the Treaty of Tordesillas was a written agreement that included the terms of the Line of Demarcation, signed by Portugal and Spain in 1494. “the actual line was unclear because geography at the time was imprecise.
What are atavistic remnant lines?
These are sharp demarcation lines that occur on different parts of the body. They have been considered as an atavistic (ancestral) remnant, where the back skin is pigmented more than the front, providing better protection from the sun.
What is a demarcation point in networking?
Simply put, the Demarcation Point, or Demarc, marks the point where the customer’s network interfaces with the network owned by another company or additional party. What is the difference between Edge and demarcation?