lentigo

from WordNet (r) 3.0 (2006)

lentigo
    n 1: a small brownish spot (of the pigment melanin) on the skin
         [syn: {freckle}, {lentigo}]

from The Collaborative International Dictionary of English v.0.48

Lentigo \Len*ti"go\ (l[e^]n*t[imac]"g[-o]), n. [L., fr. lens,
   lentis, lentil.] (Med.)
   A freckly eruption on the skin; freckles.
   [1913 Webster]