A very common benign ovarian lesion that may appear cystic is a mature cystic teratoma, also called dermoid cyst. Mature in this context means benign, as opposed to the immature, malignant teratoma. Benign cystic teratomas typically occur in young women of child-bearing age.
Medications such as aspirin, anticoagulant medications, and anti-platelet agents reduce your blood's clotting ability and make bruising more likely. Medications including aspirin, prednisone, prednisolone, oral contraceptives, and others may also weaken your blood vessels, which increases the likelihood of bruises.
As people grow older, their skin tends to become more fragile, and they lose the nice layer of fat that lies right under the skin, which used to protect them from bumps and bruises. Regarding your mother's skin issue, it is very common for this bruising to happen as people age. The splotches you speak of can be worse if someone is on a blood thinner (like Aspirin, Coumadin. or Plavix), which are commonly used to prevent strokes and heart attacks in older folks. Another medication that can do this is Prednisone, which can make the skin thin and cause bruising too.