What do white spots inside of his boxers mean?

White spots inside boxers can indicate a few things, including dried semen or sweat, which are common and generally not a cause for concern. They could also be a sign of a skin condition, such as fungal infections or irritation. If the spots are accompanied by discomfort, itching, or changes in skin appearance, it's best to consult a healthcare professional for advice. Regular washing of undergarments and maintaining personal hygiene can help prevent such occurrences.