Thanks for your query on HealthCareMagic.
We would like to have more information on this case before we can provide a definite answer:
1. Since when is the child having this problem?
2. Is it associated with fever?
3. Was there a history of injury
Under these circumstances it is always better to consult your doctor who shall examine the child and get appropriate investigations done to come to a diagnosis.
Wishing your grandson all the best.