Skin infections are caused by various pathogens, including bacteria, viruses, fungi, and parasites. Common bacterial infections include cellulitis and impetigo, while viral infections can include herpes simplex and molluscum contagiosum. Fungal infections such as athlete’s foot and yeast infections are also common. Treatment depends on the type of pathogen and may involve topical or oral antibiotics, antiviral medications, antifungal treatments, and proper hygiene practices to prevent the spread of infection.