Quite right, Robyn, it looks like it's not eczema treatment you need if it has not worked.
Anyway, whatever needs to happen will have to start with a gp consultation & obviously, you'll make this point at the appointment.
We're you referred to the breast clinic previously? If not, it maybe an idea to request this & if you were, to request another referral. If you feel it would help, it may also be an idea to ring the helpline here for advice or post on the 'ask our nurses' board. It's highly unlikely to be anything serious, but you do need to know what it is.
Have they said what the cream is for? As you say, if you've had this for a year & it's made no difference it would seem another opinion is in order. Could you go back to your dr or another dr & say what you'very said here? You are right to want to get to the bottom of it.