will form when blood collects into the cyst, this occurs normally as the blood vessel in the wall of the cyst gets ruptured.
These type of cysts will not cause any symptoms and subside by themselves most of the times.
But pain can occur because of these cysts in conditions,
when they increase in size and stretch the ovarian capsule,
when they rupture,
because of spillage of blood into the abdominal cavity when they rupture.
So, you visit your gynecologist explain your symptoms and get examination done along with ultrasound
to rule out the possibility of rupture.