Freckles usually develop in persons with light complexions. They may be found on various parts of the body, but are more common on the face and back of the hand. They usually appear after the fifth year of life and attain their maximum size by adolescence. There is no known remedy for removing them permanently, and serious scarring often results from attempts to remove them. Some fade as you age, others may be camouflaged with cosmetics.
Most adolescents have pimples when they have reached the age of puberty.
Blackheads are plugged up sebum at the pores of the sebaceous glands. Excessive growth of the horny layers of the skin at this point may be a primary cause. Their blackness is due to exposure to air and to dead cells, and not to dirt. Persons with oily skins have more blackheads than those with dry ones. The best preventive of blackheads is adequate sleep and rest, a well-balanced diet, plenty of fresh air and extreme cleanliness.