Hi there my husband was diagnosed three years ago with a tumour behind his eye it then spread to his liver, the doctor operated took away the tumour then few months later there was more tumours he went for more treatment it made tumours stable then they noticed in other scan that more tumours had appeared on liver he currently on immunotherapy but today they told him his bloods were high with his liver there not giving him more treatment until it settles they said if he notices his skin starting get yellow r fell un well to contact them I just like to know what causes skin to go yellow thank u