Blackheads are little bumps embedded into the pores of our skin. They are usually yellowish or blackish in color. Blackheads are a type of acne called an open comedone. According to medical practitioners, blackheads are the first stage of acne  The excess hormones in the skin result in stimulation of the oil gland. These glands are called sebaceous glands. This stimulation leads to excess oil production in the pores. The excess oil gets occluded in the pores resulting in a ball of accumulated oil which when exposed to air, turns black in color. There are many conditions that may cause or even worsen blackheads. Some of these causes are the use of topical oils and the use of makeup. While blackheads are present in most any skin type, they are most likely to develop on people with very oily skin.