Acne is reported to be less common in people that have a diet with lower glycaemic index, eg, natives from Kitava and Papua New Guinea, the Ache people of Paraguay, Inuits and rural residents of Kenya, Zambia and Bantu. These people tend to become sexually mature at a later age than in the cities where higher glycaemic index foods are consumed. Early puberty is associated with earlier onset and more severe acne that tends to peak at the time of full maturity (age 16 to 18).
Genetics can also have an effect on acne breakouts, and may be the reason some people are acne-prone while others are not. One of the top cited studies took a look at 458 pairs of identical twins and 1099 pairs of fraternal twins to study acne prevalence. They found that genes explained a significant 81 percent of the difference in acne prevalence, while the other 19 percent was explained by non-shared environmental factors. 
Who likes scars and that too on the face! Getting rid of acne scars is a little tougher than eliminating acne actually. Pimples can be naturally treated with many ingredients having anti-inflammatory or antibacterial properties which are in abundance in nature. However, pimple scars are a little stubborn as they don’t go easily. However, as the saying goes, nothing is impossible. It may take some time but your regular efforts using certain natural bleaching agents as well as other ingredients may lighten your acne scars and gradually remove them permanently.
Consider cosmetic surgery. As a last resort, consult with a medical professional about surgery for large, deep lesions or scars. In this procedure, a doctor will use a punch excision to cut out the scar and replace it with stitching or a skin graft. Smaller lesions require only stitching, while large lesions may require a skin graft from another part of your body.[15]
Apply fresh lemon juice. Lemon juice has natural skin bleaching properties, and can help to effectively lighten your acne scars. Simply combine equal parts lemon juice and water and apply this liquid directly onto your scars, avoiding the surrounding skin. Wash off the lemon juice after 15 to 25 minutes or you could put the lemon juice on overnight as a mask.
No one factor causes acne. Acne occurs when sebaceous (oil) glands attached to the hair follicles are stimulated at the time of puberty or due to other hormonal changes. Sebum (oil) is a natural substance that lubricates and protects the skin. Associated with increased oil production is a change in the manner in which the skin cells mature, predisposing them to plug the follicular pore. The plug can appear as a whitehead if it is covered by a thin layer of skin, or if exposed to the air, the darker exposed portion of the plug is called a "blackhead." The plugged hair follicle gradually enlarges, producing a bump. As the follicle enlarges, the wall may rupture, allowing irritating substances and normal skin bacteria access into the deeper layers of the skin, ultimately producing inflammation. Inflammation near the skin's surface produces a pustule; deeper inflammation results in a papule (pimple); if the inflammation is deeper still, it forms a cyst.
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