It is most likely that what you are describing is an anal skin tag.
Anal skin tags are shapeless flaps or lumps of flesh usually found
at the anal verge, where the inside of the anorectal canal becomes the
outside of the body. Anal skin tags are also known by the names of “cutaneous papillomae”
and “acrochordon”. Anal skin tags are an extremely common condition. They are not contagious, and may occur alone or in multiples.
Anal skin tags usually start due to an anorectal injury, trauma, or inflammatory lesion.
For example, if an external haemorrhoid swells up large and is cured at home without surgery, the haemorrhoid may leave a skin tag behind.
Another little known cause of the development of skin tags in
general, may be tight fitting clothing. For example, if the undies are
too tight, they bite into the skin, creating conditions ripe for
developing a skin tag.
Apart from cosmetic reasons, unless skin tags are causing or are prone to complications, they do not need to be removed.
When tags cause itching, pain, anxiety or hygienic problems, they can be biopsied to ensure their identity and then removed.
When small they can be removed easily under local anaesthetic at a doctor’s office on an outpatient basis.
However, if they’re either large or extensive, they must be surgically removed in an operating theatre while under general anaesthetic.
Laser surgery has offered great success in removing them while resurfacing the skin to appear normal, but is no less risky or time consuming than scalpel surgery.
I recommend that you see your practitioner for a accurate diagnosis and then to establish which treatment is best for you.
Regards Dr Sean Gomes