L27: Dermatitis due to substances taken internally

Dermatitis due to substances taken internally, as the name implies, is a form of skin inflammation that occurs due to the ingestion of certain substances. This condition is typically caused by an allergic reaction to specific types of food, medicine, or other orally consumed substances that the body senses as potentially harmful. Common symptoms usually include itchy, red, dry, or swollen skin that may appear anywhere on the body, but frequently presents on areas such as the hands, feet, face, or folds of the skin. The onset of symptoms can vary from hours to days after the substance is consumed, and the severity and progression of the condition largely depend on the individual's personal sensitivity and the amount of the allergen intake. It's important to note that this type of dermatitis affects the skin, which is part of the body's largest organ system, the integumentary system.