Impetigo is a highly contagious skin infection that primarily affects young children, although it can occur in people of any age. It is caused by bacteria, usually Staphylococcus aureus or Streptococcus pyogenes, and often appears as red sores or blisters, typically around the nose and mouth. These sores can burst, ooze, and form a yellowish crust. The infection spreads easily through direct contact with an infected person or by touching contaminated surfaces. Treatment usually involves topical or oral antibiotics to help clear the infection and prevent complications. Good hygiene practices can help reduce the risk of spreading impetigo.