Lump inside my left side of anus, is it hemorrhoids?

Could be. It could be hemorrhoids, but it is impossible to know without having a thorough exam from a qualified physician. If your primary care physician is uncertain as to what the lump is, consider seeing a surgeon or a gastroenterologist.
Could be. Could be hemorrhoids, or an abscess or or a tumor either benign or malignant. In any case see a colorectal surgeon for proper evaluation.

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