Given the symptoms you reported (fell, felt tight, had massage the next day, sciatica in left cheek and lower leg), it seems possible that you might have experienced sciatica due to minor trauma. It is likely that the trauma did not harm bones or ligaments.
Muscles might have been affected and when constricted they might have put pressure on the sciatic nerve, which caused the pain along the nerve. The pain might be relieved with physical therapy done by a specialist in physical therapy whom you are advised to visit.
The true nature of the 2 hypoechogenic spots on the mammography cannot be determined without an additional examination. They might be cysts filled with liquid. The scar tissue cannot be ruled out either, although it usually causes shade when seen on a mammography and is hyperechogenic when detected with an ultrasound.
You might want to visit a specialist in radiology or oncology to consult about the true nature of the two lesions.
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