Very TMI - but every few months my vagina gets sore on the outside and quite itchy with light bleeding (although bleeding could be breakthrough) the very first time I got treated for thrush but it keeps happening but not as severe... any one relate ?

Get it checked by a doctor, it’s not normal for it to keep coming back regardless of if it’s as severe or not

Do u have any idea why it would come back tho ?

See a doctor. It could be recurring for any reason. Perhaps the infection has never really gone away. Definitely get it checked anyway.