Welcome to Healthcare Magic Forum.
You should understand the limitations of coming to a diagnosis without a physical examination.
From your query I understand it is painless, present for a long duration of time and not affecting your daily activities. And so it must be a benign condition.
These could be the probable diagnosis:
These conditions do not require an immediate surgical intervention.
Indications for its removal would be:
1. Cosmetic reasons
2. Causing discomfort
4. Rapid increase in size
5. Change in appearance
Hope I have answered your query.