http://www.prlog.org - Acne is one of the common skin problem faced by millions of people all around the world. Though it mainly affects the facial skin, it can also be seen on the neck, chest, back and upper arms in the form of pimples. Some pimples may be pus filled making it painful and irritating. Although it is regarded as a teenage disease, in some cases it may continue through the adult life. The exact reason for the development of acne is still unknown. It is supposed to be developed as a result of excess oil secretion and over stimulation of skin glands.