FSH causes the ripening of the egg inside a follicle in the female body. One of the two ovaries of a woman releases one egg each month. The follicle, a bag filled with fluid, houses these eggs. FSH or follicle-stimulating hormone helps in the maturing of the egg inside the follicle.LH or luteinizing hormone comes into play once the egg is mature inside the follicle. A surge of LH hormones causes the release of this egg from inside the ovary. Once the egg is released, the rest of the follicle starts secreting progesterone and some estrogens.