to cause to hold or exhibit a particular bias; to influence, especially unfairly: a tearful plea designed to bias the jury; a survey biased toward highly educated people. 11.
Moles are caused when cells in the skin, called melanocytes, grow in clusters or clumps. Melanocytes are distributed throughout your skin and produce melanin, the natural pigment that gives your skin its color.
1 Sun exposure seems to play a role in the development of moles and may even play a role in the development of atypical, or dysplastic, moles. 2  The role of heredity cannot be underemphasized. 3  Many families have a type of mole known as dysplastic (atypical), which can be associated with a higher frequency of melanoma.