Hi

Just been to GP and mentioned a mole which I think looks suspicious. It's recently changed shape slightly. I previously asked about this mole as I thought it was bigger since I've had children and breastfed, with doctor previously being dismissive of it (I didn't know whether it was bigger just because my breasts had stretched through pregnancy etc). 
GP had a look at it today and is sending me to dermatology clinic but I'm just wondering a) how concerned I should be and b) whether this could be a sign of skin or breast cancer due to its location c) whether it'd be worth going private if speed is needed if could be breast cancer. It's worth noting I'm a tad hypervigilant about breast cancer as my mum has had 2 hormone breast cancers and is now end of life with triple negative breast cancer. 
 

Thanks!