I have to chime in and agree, you should get a biopsy for safety and peace of mind.
My own melanoma (stage 1a, .47mm) looked just yours. Of course, this does NOT mean that yours is a melanoma – just that it can’t be ruled out. I had to wait 8 months to get a biopsy on mine, and in that time I took many close-up photos because it worried me a bit. During all that time, it did not change – and yet it turned out to be mel. It had no ABCDE signs … it was just an “ugly duckling.” My instincts told me to be concerned about it.