Should I go back to the doctor.

[Gizmosnana]

Last year I had a mole checked by my GP he said it was fine.
It was on the top of my left shoulder. Very flat and even.
Last week it started to go scalely.
If it's worth mentioning I had radiotherapy in April on my
left boob.

If you're concerned about any change I'd speak to the GP

It's always a good idea to get a changing mole checked out.

Having had many dodgy moles removed I've always been told to report any changes no matter how small because its better safe than sorry. I've been lucky so far as they've all either come back as benign or with clear margins (they got it all before it had spread)

Ask for a referral to dermatology....they are the experts