Tiny itchy bumps suddenly appeared

Hey all, so i've had these bumps before now but they've gone away on their own - they're tiny almost blister like? skin coloured bumps - they're incredibly itchy and always come up around my wrists / base of my hands. I'm currently taking norethisterone to delay my period but on no other medications.. haven't used any different products on skin, hair, washing etc. My whole body tends to get extremely itchy when i'm hot in the bath or in bed? Any idea what they are anyone? There's a few more than what can be seen on the pictures i'd say about nine or ten per wrist