What is going on with this mole and should I be worried? (photo)

I suggest seeing a cosmetic dermatologist for a formal evaluation. This can be improved or removed with lasers, radiowave or shave. Best, Dr. Emer

It is always difficult to tell from a photograph, but since your mole has been changing, you should be safe and have all your moles carefully evaluated. Please use the ABCDE's as your guide for when to be concerned about moles: A for Asymmetry; B for irregular Borders; C for black or uneven Colors; D for Diameter greater than a pencil eraser; and E for a growth that is Evolving or changing. If necessary, it is an extremely simple five minute procedure for a dermatologist to remove the mole on your back using a "shave" biopsy which typically leaves a minimal scar. The mole can then be checked microscopically for reassurance.