What is classified as a secondary lesion that may be infectious and requires medical attention?

An ulcer is classified as a secondary lesion that may be infectious and requires medical attention due to its characteristics and potential complications. Ulcers are open sores that can occur on the skin or mucous membranes and may result from various causes, including infections, poor circulation, or underlying medical conditions. They can be painful and are often associated with inflammation and tissue loss, which can make them susceptible to bacterial invasion.

Because ulcers can indicate more serious health issues, they typically require evaluation and treatment by a medical professional. In contrast, pustules, fissures, and patches have different forms and implications. Pustules are small elevations filled with pus and can indicate a localized infection but are not necessarily classified as secondary lesions requiring medical attention in the same way ulcers are. Fissures are linear breaks in the skin that can be painful but do not typically indicate an infection. Patches are flat areas of abnormal skin coloration or texture, generally non-infectious and cosmetic in nature.