What does the term "Koebner phenomenon" refer to?

The term "Koebner phenomenon" refers to the formation of new skin lesions at sites of minor trauma. This phenomenon is particularly notable in certain dermatologic conditions such as psoriasis, lichen planus, and vitiligo, where a person may develop new lesions following cuts, scrapes, or other forms of skin injury. The underlying mechanism is thought to involve an immune response that is triggered by the injury, leading to pathologic changes in the skin.

Recognizing this phenomenon is crucial in dermatology because it can help clinicians identify and manage skin conditions more effectively. Understanding that trauma can exacerbate certain skin diseases allows for better preventive care and counseling for patients. Thus, the correct definition captures not only the definition but also the clinical relevance of the phenomenon in dermatologic practice.