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.