I don't you need to be worried, girlgirl... The lump almost surely is not cancerous. But then you should tell your doctor about it anyway, if not make an emergency appointment,
Lumps like that are very, very common, and it may be little cyst. Is it always there or does it come and go?
In any event, I understand your concern, but also feel I can reassure you.
thanx alot this has really helped, as breast cancer is in my family i automatically panicked ure comment has reassured me thankyou xx