It could be a  Spitz nevus that  is a relatively rare type of non-cancerous skin tumor. They tend to grow rapidly at first, forming pink or brown bumps on the surface of the skin

Portrait of a Young Man with a Lamp, Lorenzo Lotto (ca. 1506-08) Kunsthistorisches Museum, Vienna, Austria.

Nevi are macules, papules or nodules, most often brown or flesh-colored, made up of clusters of melanocytes or nevus cells.

Portrait of Frederick of Montefeltro in a painting by Piero della Francesca (1470-1473), Uffizi Museum, Florence, Italy.