Hi,Dear,Welcome with your query to HCM.
Studied your query in full depth of its details.Reviewed it in context of your health concerns.
Based On the facts, You mostly seem to suffer from-
Congenital 
Dermoid Cyst ,which would be confirmed by CT Skull to assess its intracranial extension.
Treatment -
Consult a Surgeon and confirm the type of Congenital Dermoid Cyst.
Confirm if it has Intra-cranial Dumb-Bell extension,as to avoid on-Table complications while Surgically excising such a lump.
NeuroSurgical Excision for those dermoids having IntraCranial extensions  may be needed.
Hope that ,This reply would help you to plan further treatment soon with your treating doctors.Best of Luck and early recovery.
Welcome any further query in this regard,which would be replied in next 
session.
Good Day!!
Dr.Savaskar M.N.
Senior Surgical Specialist