My mom has always had bad hyperpigmentation and skin darkening.i used to have clear skin but when i turned 18 my skin started becoming like mom.help!?

Avoid the sun: Many causes but very common for women is melasma. Heat and sun and hormones make it worse. Use spf 30 or higher with at least 5% zinc oxide or titanium dioxide as soon as you wake up in the am and reapply every 2 hrs plus a hat. There are many bleaching creams out there and chemical peels but must be done under a dermatologist supervision as if not used correctly, can make the pigment worse.