Hi,Dear Thanks for the query to HCM virtual Clinic.
I studied your query with available details given in your query.
I understood your health concerns.
Cause of the painless anal lump -
From the facts given in your query,you seem to have-Sebaceous
Cyst or Epidermoid Cyst- 1 cm above anus and is in the skin of anus.
I would advise Excision
Biopsy after the FNAC biopsy if need be, to fix it being cancerous, which is remote possibility in your case.
Don't worry for your peri-anal lump to be cancerous till FNAC biospy HPR report confirms it.
Don't Self-treat or medicate in your case as the case may go in to further complications.
Hope this reply would resolve your query and would help you to plan treatment with your doctor.
Hope this would relieve of your health concerns.
Welcome for any further query in this regard before final suggestions are given in your query.
Wishing you fast recovery..
Have a good day.
Dr.Savaskar M.N.
Senior Surgical Specialist.