Skin darkening & dry skin

I was already pretty dark skinned before I was pregnant but lately I’ve been noticing like splatters or darker patches near my arm pits and breast & near my bikini line. I thought I’d be able to just scrub it off in the shower but nothings working ): I also noticed my breasts & bottom of my belly are lot drier than they’ve ever been & I moisturize daily with baby oil and cetaphil lotion.

Any recommendations

Is anyone else experiencing skin darkening & drier skin ?