The integumentary system consists of the skin, hair, and nails. The skin acts as a protective barrier against pathogens and regulates body temperature. It contains glands that secrete oils, sweat, and pheromones. Common disorders of the skin include bacterial infections like impetigo, viral infections such as herpes or shingles, fungal infections like ringworm, and inflammatory conditions like eczema or psoriasis. The causes of these disorders vary and may include microorganisms, allergic reactions, overexposure to irritants, genetic predispositions, or physical trauma.