Skin Tags On Dog Lip Dog With A Skin Tag?

Dog with a skin tag? - skin tags on dog lip

My seven years (from the adoption of protection estimated) Mischlingshündin has a small piece of skin on the lip. It is like a day of the skin that some people there have neck or back. It is the same color of the lips, and only about 2 mm long. Of course, this does not mean to disturb. There for about 6 months and has not changed at all.

Could or should they be removed?

What cause?

Thank you!