Symptoms of PCOS may include: Missed, irregular, or very light periods, Ovaries that are large or have many cysts, Excess body hair, including the chest, stomach, and back, Weight gain, especially around the belly (abdomen), Acne or oily skin, Male-pattern baldness or thinning hair, Infertility, Small pieces of excess skin on the neck or armpits, Dark or thick skin patches on the back of the neck, in the armpits, and under the breasts