What is the first sign that a laceration may need medical attention?

A laceration that is greater than half an inch in size is a clear indication that it may require medical attention. This threshold is significant because larger wounds can be more complicated to manage and may require stitches to close properly. Larger lacerations are also more likely to involve deeper structures such as muscles, nerves, or blood vessels, which can increase the risk of complications if not treated appropriately.

Minor bleeding, localized pain, and the presence of a bruise can sometimes occur with small or superficial lacerations and might not necessarily indicate the need for professional medical treatment. While these signs should not be ignored, they do not provide the same level of urgency as a wound of a significant size, as larger lacerations are generally more problematic and can lead to increased risk of infection and improper healing if left untreated.