Hi I got my partial zsr circumcision on 28 of last month everything is fine but the skin that is half left automatically rolls back behind mushroom round and get swell my doctor told me to keep the foreskin a head and not retracted behind always so like when ever I do it automatically rolls back 70% back and a little bit of errection get it roll back 100% behind mushroom so what should I do to keep it up and is it something to worry if it keeps rolling back behind mushroom.