The blackheads are caused by over active sebaceous glands. The excess secretion of oil expands and thickens the pores of the skin. The oil collects in the pores and hardens into a plug. The pores are then clogged with hardened sebum or oil. Since the pores are open, the tip of the clogged grease is exposed to the air and oxidises, turning black. Therefor, blackheads are formed.
I hope this is hopeful! :)
المصدر : عرب مكس
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