Pimples and blackheads are common aggravations of puberty, but about 40 percent of adults also get acne, experts say.

"Many people struggle with stress on a daily basis and don't eat nutritious foods. This is reflected in the condition of their skin," says cosmetician Gabriele Haeusler of Berlin. One of the most common problems is acne.

"It can have different causes," says Gisela Hubbes, a dermatologist from Duesseldorf. The skin reacts to the causes, for example, medications or stress, by breaking out in pimples and inflammation. In addition, fluctuations in hormone levels can also trigger acne in adults.

(Agencies via China Daily December 14, 2007)