Blood Types and the Population. O positive is the most common blood type. Not all ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of Oâs, while Asian people have a relatively high number of Bâs.The mix of the different blood types in the U.S. population is:n addition to the A and B antigens, there is a third antigen called the Rh factor, which can be either present (+) or absent (â). In general, Rh negative blood is given to Rh-negative patients, and Rh positive blood or Rh negative blood may be given to Rh positive patients.
Medical Definition of LENTIGO. 1. : a small melanotic spot in the skin in which the formation of pigment is unrelated to exposure to sunlight and which is potentially malignant; especially: nevusâcompare freckle. 2. : freckle.
Get the Latest health and medical information delivered direct to your inbox! Lentigo: A type of freckle that is a small tan, brown, or black spot which tends to be darker than the usual (ephelis-type) freckle and which do not fade in the winter.This kind of spot is referred to as lentigo simplex.Although lentigines may be part of a genetic disorder, for the most part they are just isolated and unimportant spots. (The genetic disorder in which lentigines occur is called the LEOPARD syndrome .).Lentigo is the Latin word for lentil.his kind of spot is referred to as lentigo simplex. Although lentigines may be part of a genetic disorder, for the most part they are just isolated and unimportant spots. (The genetic disorder in which lentigines occur is called the LEOPARD syndrome .). Lentigo is the Latin word for lentil.