Hi!
Is this lump right on your anal opening? What's the size of it? Does it feels small as a pea and solid on touch? What's its color? Do you find it more painful when you're passing stools? Have you noticed blood in your stool or on a toilet paper?
This lump could be a perianal haematoma, leak of blood just under the skin from the tiny blood vessels that can rupture when the anus stretches during the bowel movements. Haematomas, usually, do not need any treatment and in two weeks are getting painless and slowly start to shrink in size.
Do you have frequency of your bowel movements changed in time? Are you straining to move stool? Do you have chronic constipation or diarrhea?
You may have hemorrhoids( swollen or inflamed veins around the anus or inside the lower rectum.) Actually, you are probably having thrombosed external hemorrhoid that can be find as painful swelling or a hard lump around the anus that results when a blood clot forms. its symptoms, in most cases, will go away within a few days.
Hope i helped a bit!
Best regards!
Marija

Your reply as above is exatly my sysmptom. what is it? it's been for weeks now but still there. it bleeds when i stool, and the sort of constipation i have is terrible, very painfull, and every thing i eat seems to get stuck in my belly. also i am African so the lump is brighter than my skin colour, somwhat fair in complextion compared to my skin colour. HELPPPPPPPPPPPP! AGH!!!