Skin and soft tissue infections (SSTIs) are a range of problems that can affect your skin and the soft parts underneath. They can be as simple as a little red spot or as serious as necrotizing fasciitis, where the infection spreads deep into your body. These infections come in different forms, with different causes, and can vary in severity. It is like a big puzzle with many pieces to understand: types, causes, clinical manifestations, diagnosis, and treatment strategies.