What skin condition might indicate a systemic infection?

Petechiae are small, pinpoint red or purple spots on the skin that are caused by bleeding underneath the skin. This condition can be an important indicator of a systemic infection, particularly if it occurs alongside other symptoms such as fever or general malaise. Petechiae can be associated with several serious infections like meningococcemia or viral illnesses such as in cases of sepsis, where the body is responding to a widespread infection. The presence of petechiae should prompt immediate medical evaluation, as they can suggest complications beyond just localized skin issues.

In contrast, urticaria, or hives, typically relates to allergic reactions and does not inherently indicate infection. A normal temperature does not signify any infection or skin condition at all; rather, it suggests that there is no fever, which is a common sign of infection. Diaphoresis, or excessive sweating, might be present in infections but is non-specific and can also occur due to anxiety or other factors not related to infection. Thus, petechiae serve as a more direct indication that a systemic infection might be present.