Thrombosed External Haemorrhoids. Else?

It formed on 25 th night. I soaked with cloth deepen warm water. First it was reddish lump with a smaller side inflation. But for the last two days a black spot generated in the circle of that. Last day i have not gone through water soaking. Tonight i have gone through this. Based on the blackened area, do you think it's just necrotic tissue from the thrombosed hemorrhoid, or could it be something else? I have images for each day. The blackened area is almost same from the day 2 . On day 2 it was a little bit blood shedded type. But there was no blood indeed. On day 3 the spot blackened and the shedding sight was gone. I think on day 4 it's a bit larger dark spot. On the very first night, it was a reddish lump only. There is no fever. Pain for two to three minutes occur twice or thrice a day. I don't suffer from any disease . But, I have some issues with my stool clearances once with mucus. I need to go for twice or thrice a day. I suggest a Proctologist could identify it faster.