I Had Bed Bugs In My Home, Due To The

I had bed bugs in my home, due to the bites I used to get red marks on the waist, hands, arms, shoulders It is itchy, so when I scratched it , it will become red and after few days when the itch is gone it will turn black, leaving black spots behind.
Now bugs are gone but my body is always itchy, sometimes in sleep I scratch so much that it bleeds like a pimple on face bursts, then those bleeding will have clotting and then it will leave a black spot.

The bugs are not in house anymore but I still feel itchy whole day where ever I go.
What medicine you can suggest and is this happening due to bug as bugs are no more in house or is it allergy or skin infection?

I always feel something moving on my hands and back, but whenever I check its nothing, even when I am in office I get that feeling