Some children have difficulty learning social skills. In more severe cases, these children are diagnosed with a nonverbal learning disability such as Aspergers or Autism because of their inability to understand or respond to social cues. Here is a link to our section on nonverbal learning disabilities.
You may also want to peruse our section on behavior and social skills.
If this is becoming a problem for your child at home and in peer groups, you may want to request a free educational evaluation through your public school. This will give you a better sense of your child’s skills and deficits, and where you can find help addressing his issues. Here is information on who can diagnose learning disabilities.