Plain Facts for Old and Young by John Harvey Kellogg

30. _Acne_, or _pimples_, on the face are also among the suspicious

signs, especially when they appear upon the forehead as well as upon other portions of the face. Occasional pimples upon the chin are very common in both sexes at puberty and for a few years afterward, but are without significance, except that the blood may be somewhat gross from unwholesome diet or lack of exercise.