Acne is very common amongst teens as signs of adolescence yet it is considered to be a stigma by most of them. In the initial stages of puberty, it is caused due to hormonal changes that increase the levels of androgens that enlarge the pores and cause more sebum to be produced and hence lead to breakouts
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At the later stages of life, this is what causes acne. It is caused due to clogged pores. Pores can be blocked because of hair follicles, bacteria and dead skin cells. This results in inflammation within the clogged pore. The white and red blood cells replicate within the inflamed pore and lead to eruption which is the acne. Also it can result in blackheads, whiteheads, nodules, cysts and many other types of pimples.