any advice on what it is????

I've been spotting for the past few days/weeks and this is what it looks like. It's definitely not my period because I'm a very heavy bleeder and my blood always comes out very dark (btw..I haven't had my period for quite a few months now, so I'm not sure what it is).

(August 18, 2018)

(September 2, 2018)

(September 4, 2018)