Unfortunately, pregnant women are especially sun-sensitive. In addition to a traditional sunburn, pregnancy also leaves you vulnerable to developing dark patches around your lips, chin, cheeks, and forehead. This condition is known as melasma and occurs in about half of all pregnant women.
Doctors believe the cause is increased estrogen levels stimulating the production of melanin (which makes us appear tan). Your best defense is a sunscreen with an SPF of at least 30. Dermatologists also advise moms-to-be to sit under an umbrella or in the shade when outdoors for long periods. Since melasma can take up to one year after delivery to fade, it's worth skipping a summer in the sun to prevent this long-lasting beauty bummer.