In women with PCOS ovulation doesn’t occur regularly and usually they have ovaries with a thick outer layer. The ovaries make more testosterone, the male type of hormone. High testosterone levels lead to irregular menstrual periods, acne, and extra body hair.
Ovarian drilling is done to break the thick outer surface and destroy some of the testosterone producing tissue made by the ovaries. This can help the ovaries release an egg each month and start regular monthly menstrual cycles. This may reduce symptoms of excess testosterone