Itching all over.

I’m on my 3rd trimester and I’ve started itching from end of 2nd trimester till now, my ankles, my legs and hands itch and worst one on my tattoos which are many years old, I have like tiny rash that comes and goes. now I have tiny scabs due to scratching, it’s uncontrollable. Doctor gave me moisturiser cream which doesn’t help with the itch.