Hi and welcome to the forum! I am glad that I can help you.
You want to know the cause of the symptoms that you experience.
There are several conditions that may be presented as a painful lump near the rectum, such as perianal abscess, fistule and hemorrhoids. Perianal abscess and fistule are characterized by pain in the anal area, increased body temperature or sometimes a release of pus. Hemorrhoids are characterized by constipation accompanied with pain when defecating and fresh blood in the stool.
According to the data that you described, you may or may not experience one of the medical conditions listed above. See your doctor for further diagnosis. You may also consider seeing an abdominal surgeon if diagnosed with a perianal abscess or a fistule.
Please keep in mind that I provide medical information only. I am not able to diagnose medical conditions online. Please contact your doctor for further advice and information about diagnosis and treatment options.
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