Jan 19, · Acne is less common on the scalp than on other areas of the body, but it can be just as troublesome. Clogged pores often cause pimples on the scalp, or scalp acne. Keeping the hair clean and using. Jan 12, · Acne is caused by blockage of the facial hair follicle. Hence, it is expected in areas where facial hair grows. Among many reasons, when the facial hair grows, and there is poor grooming, it can block the hair follicle. By implication, the hair follicle blockage caused by dust and dirt accumulation can cause an acne breakout.