Hello,
What you seem to be having are called chloasma of pregnancy. These changes are caused by hormonal changes during pregnancy, which stimulate a temporary increase in your body's production of melanin. Women with darker complexions are more prone to this condition than women with lighter skin.
Treatment options include treatment with vitamin C and hydrocortisone, peel with carbon dioxide snow and alexandrite and ND-Yag Q-Switched laser treatment preceded by a hydroquinone-based application.Pls discuss these options with your dermatologist.
Hope it helps. Take care and pls do keep me posted on how you are doing if you have any additional queries.
Im facing the same problem since i ws in 5th mnth nw m in my 9th mnth...my uper lip,lower lip ,chin n neck is gtting darker day by day getting dark patches,, m too much worried as im nt a,dark complexioned m wheatish thn y im geting ths all pls,do help if possible