Freckles

"Freckles, or the round or oval-shaped yellowish or brownish-yellow spots, resembling stains, common on the face and the backs of the hands of persons with a fair and delicate skin who are much exposed to the direct rays of the sun in hot weather, are of little importance in themselves, and have nothing to do with the general health. Ladies who desire to remove them may have recourse to the frequent application of dilute spirit, or lemon juice, or a lotion formed by adding acetic, hydrochloric, nitric, or sulphuric acid, or liquor of potassa, to water, until it is just strong enough to slightly prick the tongue. One part of good Jamaica rum to two parts of lemon juice or weak vinegar is a good form of lotion for the purpose. The effect of all these lotions is increased by the addition of a little glycerine. The preceding are also occasionally called “common freckles,” “summer freckles,” and “sun freckles.” In some cases they are very persistent, and resist all attempts to remove them while the exposure that produces them is continued. Their appearance may be prevented by the greater use of the veil, parasol or sunshade, or avoidance of exposure to the sun during the heat of the day. Another variety, popularly known as cold freckles, occur at all seasons of the year, and usually depend on disordered health or some disturbance of the natural functions of the skin. Here the only external application that proves useful is the solution of bichloride of mercury and glycerine, or Gowland's lotion."

(Gowland's Lotion was a wonderfully poisonous mixture of bitter almond oil and bichloride of mercury. Of course, don't ever actually use this.)