After a woman is sexually aroused by sexual desire or stimulation, the labia will undergo some changes in form, becoming thinner, flatter and producing an upward and outward elevation or displacement, while the tissues become engorged with blood, which will manifest in appearance as swollen labia, which will gradually return to their normal state after orgasm or when sexual excitement subsides. If there is only a change in form and no symptoms such as pain, there is no need to worry.