The most common place on the face is the nose. Blackheads can appear not only on the face, but also on the back, chest, neck, arms and shoulders.
Why do black dots occur?
Blackheads occur when a blockage occurs in the follicles in your skin. Each follicle contains a hair and an oil-producing sebaceous gland. This oil, called sebum, helps keep your skin soft. Dead skin cells and oils collect in the opening to the skin follicle and are called comedones. If the skin over this follicle opening remains closed, it is called a white spot; when the skin is opened, it is exposed to air and blackheads occur.
Certain factors can increase the risk of developing acne and blackheads. These are as follows
• Producing too much body fat
• Accumulation of Propionibacterium acnes bacteria on the skin
• Irritation of hair follicles when dead skin cells are not shed at regular intervals
• Exposure to hormonal changes that cause an increase in oil production during adolescence, during menstruation, or while taking birth control pills.
• Taking certain medications such as corticosteroids, lithium or androgens