Thank you for the query.
Usually painless lump in the anus area is a hemorrhoid
. It should be soft, with smooth surface. It can be skin colored or can get purple. Hemorrhoid can get painful due to blood clot in it.
Other possible reason of such lump is anal fissure
. However this condition gives strong pain while passing the stool. The lump outside the anus which appears with the fissure is called sentinel pile.
Both conditions are caused by constipation
, pushing hard on stool. Hemorrhoid can also appear due to pregnancy
I suggest you to increase fiber rich products and mineral water intake. Sitz baths with Quercus Cortex, hemorrhoids suppositories should be also helpful. You should also wash your rectum
after every stool. This treatment can ease the symptoms of this lump, can make it smaller, but it wont disappear by itself. So the permanent cure can be surgical removal of it.
Hope this will help.