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This is Dr. Diego, experienced in Internal Medicine, Pulmonary and Critical Care.
I understand your concerns. Does he have any medical conditions? Any family history of medical conditions? Any recent travel? Do you have a picture of the lesion?
You can upload the picture to this conversation.
When you apply pressure to the area does it disappear or not?
The lesion is most likely an ecchymosis also know as a bruising. Usually these lesions are seen after direct trauma to the affected area. At his young age some conditions could cause this including platelet dysfunction and coagulation problems. Some medications like aspirin can affect the platelet function and cause this problem too. He should see his PCP and have blood work done including a CBC to check for platelets and a coagulation panel. Let me know if you have any other question.