Which injury observed on Trystan is suspicious and may indicate abuse?

Welts and blisters shaped like a strap or belt are highly indicative of potential abuse because they suggest a mechanism of injury that is consistent with the use of a physical object, specifically a strap or belt. This pattern is commonly recognized in cases of abusive behavior, as it is unusual for injuries to occur in such a distinct formation from normal play or accidental incidents.

The presence of welts and blisters also suggests that the injuries were likely inflicted with force and may have been intended to cause harm, which heightens the suspicion of abuse. In the context of child protection, understanding these specific injury patterns is critical for professionals tasked with recognizing the signs of abuse.

While the other options—like scrapes, minor cuts, and bruises—can appear in various circumstances and might result from everyday activities, they do not present the same clear indications of abuse as the welts and blisters. These other types of injuries could be consistent with normal childhood activity or accidents, making them less suspicious in comparison.