Skin diseases are conditions that affect the skin's appearance, texture, and function. They can be caused by various factors, including infections, allergies, genetic predispositions, and environmental influences. Common skin diseases include eczema, psoriasis, and acne, each presenting unique symptoms and requiring different treatment approaches. Diagnosis of skin diseases often involves a physical examination and, in some cases, laboratory tests. Treatments may include topical creams, oral medications, or lifestyle changes to manage symptoms and improve skin health. Maintaining proper skin hygiene and protection can help prevent some skin diseases from developing or worsening.