Thank you for your query,
Regarding tummy pain, the ultrasound
is normal so nothing to worry. Nonspecific abdominal pain
is common. Complete urine examination should be done to rule out urine infections as it is a common cause of pain abdomen.
This hard lump may be a ganglion
as it is moving with opening and closing hand.So consult your Doctor to confirm it and to advise appropriate management.
Hope i have answered your query.