mom, i had this when i started taking vitamins givrn by my OB,before that wala naman. as in namumula na parang bungang araw un buo likod ko, even my arms and my thighs started to itch. so my hubby and i concluded its either the vitamins or the folic acid, i stopped taking the vitamins for 3days and it stopped, then i took again the vits and soon enough, itching started again, that's when i finally decided to have my vitamins changed by my OB. now i'm okay, no more rashes 😉