abnormal moles - unsure whether to get it checked

hi everyone 

recently i've noticed i have a few moles which seem quite abnormal. the main one being on my hand. i have had this mole for a long time and was just a normal mole at first. it's been growing bigger for a few years now and i'd say the last year maybe has grown a lot more. it's about the size of an average mole, is raised and is black with an almost white lump underneath. 

 

i feel a bit silly going to the GP if it's nothing but feel i should get it checked out. i'm really not sure what to do

 

Thankyou