Skin infections occur when harmful bacteria, viruses, or fungi invade the skin, leading to inflammation and other symptoms. Common types include bacterial infections like impetigo, viral infections such as herpes, and fungal infections like athlete's foot. These infections can cause redness, swelling, pain, and sometimes pus formation. Treatment for skin infections often involves antibiotics for bacterial cases, antiviral medications for viral infections, and antifungal treatments for fungal issues. It's essential to keep the affected area clean and dry, and in some cases, medical attention may be necessary to prevent complications.