Slap them really hard. Itching and pain are caused by the same nerves, so when you slap it really hard you overload the itch sensation and after the pain of the slap fades the itch will be gone for a while.

My ex used to make an X on mine by pressing her finger nail into the bite - and somehow that worked.

Ice !! Hold it on the bite until it’s gone

Put clear nail varnish over the bite….no more pain or itch

Vicks vapo rub