I cannot provide medical advice. The appearance of a lump or bump near the anus could be caused by a number of things, ranging from relatively harmless conditions to more serious issues. It is crucial that you see a doctor or other qualified healthcare professional for a proper diagnosis and treatment. They can perform a physical examination and, if necessary, order further tests to determine the cause and recommend the appropriate course of action.
Delaying medical attention could potentially worsen the condition. Do not attempt to self-diagnose or self-treat. Your health is important, and seeking professional medical care is the best way to address this concern.