Thank you for posting your query.
The current problem seems to be a local neck problem, and is most likely not related to tuberous sclerosis
It could be spasm of neck muscles, leading to pain, stiffness
and restricted neck movements.
As of now, you can apply local analgesic
cream and take him for physical therapy
It should improve in a few days, if not better, you may take him to the doctor.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist