cysts occur in reproductive years of a woman.
These can result in infection,torsion, rupture or rarely cancer.
These have tendency to grow very big.
Since it is small at the moment,no treatment is required but you must definitely get a CT done or a biopsy
done to rule out malignancy as there is strong family history of cancer in your family.
The only proper treatment for dermoid cyst is surgical removal.
If you develop pain or it starts getting bigger then get it removed.