Final answer:
Red/white skin lesions require careful clinical examination and may represent conditions such as ringworm, bacterial infection, or necrotizing fasciitis. Diagnostic methods include Wood's lamp usage, microscopy, and culture tests. Appropriate and immediate treatment is crucial, especially for life-threatening conditions.
Step-by-step explanation:
When observing red/white skin lesions, it's essential to consider various clinical presentations to proceed with the correct diagnosis and treatment. In the given cases, different conditions such as ringworm, bacterial infections, and potential necrotizing fasciitis are described. Each requires a specific approach for diagnosis and treatment.
For instance, ringworm can be identified with a Wood's lamp and confirmed microscopically by the presence of macro- and microconidia in Trichophyton rubrum, as fungal cell walls are visible, which are not found in animal cells. Sam's purulent lesion suggests a bacterial infection, which could be confirmed with lab analysis, while Mark's severe symptoms required immediate treatment for necrotizing fasciitis, which is a rapidly progressing infection that affects the deep layers of the skin and subcutaneous tissues.