"I often recommend PCA Skin Pigment Gel to patients looking to treat scars left behind from acne," explains Rebecca Kazin, a dermatologist at Washington Institute of Dermatologic Laser Surgery and Johns Hopkins department of dermatology. "This gel contains 2 percent hydroquinone blended with other skin brighteners, like kojic acid, resorcinol, and azeleic acid, which work to lighten the pigmentation without irritating the skin," she says. The addition of lactic acid helps maintain moisture to prevent overdrying, which can worsen pigmentation.
Acne (acne vulgaris, common acne) is a disease of the hair follicles of the face, chest, and back that affects almost all teenagers during puberty -- the only exception being members of a few primitive Neolithic tribes living in isolation. It is not caused by bacteria, although bacteria play a role in its development. It is not unusual for some women to develop acne in their mid- to late-20s.