-..-

blocked follicles, that's what.

• Acne can occur due to your bacteria infection, hormones, diet, stress ( !!! poor mi ~ ) , family history and even your skin type.
• Those who have oily skin type have higher chance of having blocked pores which will result in pimples or acne.
• The oil glands produced sebum ( a kind of oil to keep our skin moisturized. ) which is a nutrient for the growth of the bacteria. During puberty, the oil gland produced more sebum which accelerates the growth of the bacteria. 
• The inside walls of the follicles becomes stickier and eventually causes blockage on the pores.

so now u get it.

... don't pressure mi.