Why does applying topical corticosteroids to damaged skin increase the risk of secondary bacterial infections?

💡 Explanation

Corticosteroids suppress the local immune system, because the mechanism of action involves inhibiting inflammatory cytokine production; therefore, the skin barrier's ability to fight off bacteria decreases, rather than increasing melanocyte activity, enhancing regeneration, or stimulating Langerhans cells.

• Why does severe B12 deficiency primarily impair erythropoiesis (red blood cell production) in bone marrow, rather than equally affecting all rapidly dividing cells?
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