What are the small bruise like marks on your sons arm that do not hurt?

If your son has small, bruise-like marks on his arm that do not hurt, it's important to take him to see a doctor to determine the cause. These marks could be a sign of a variety of medical conditions, some of which may require treatment. The doctor will be able to examine your son and order any necessary tests to identify the cause of the marks and provide appropriate treatment if needed.