A blackhead is a plug on the skin pore which consists of your skin's natural lubricant (sebum) that is mix of skin oil, dirt, dust and pollution stuck in your pores. a blackhead is mainly caused by the lack of required hydration in your body. Not caring enough for your skin and at times even neglecting basic hygiene like cleaning your face could lead to skin pores getting blocked. Excessive oil production which comes to us genetically, with age or environmental factors is the primary cause of pores getting choked with dust and dead skin that form a black head.  For ladies the type of makeup they wear plays a part in the way their facial skin shapes up. Makeup left unclean for long can lead to widening of the skin pores. Therefore it is important for us to follow a routine which is ideally suited to maintaining healthy and clean skin.