Question

Koebner's phenomenon is seen in all of the following, except?

• A. Vitiligo
• B. Psoriasis
• C. Lichen Planus
• D. Herpes

Hint:

Koebner's phenomenon is an important feature in dermatology, especially for diseases like psoriasis and vitiligo, where trauma can induce new lesions at the site of injury.

Answer 1

The Correct Option is D

Vitiligo: This is true. Koebner’s phenomenon, also known as the isomorphic response, occurs when new lesions appear on previously unaffected skin due to trauma or injury. This phenomenon is seen in vitiligo, where new depigmented patches can develop following trauma to the skin.
Psoriasis: This is true. Psoriasis is one of the conditions most strongly associated with Koebner’s phenomenon. New psoriatic plaques can appear at sites of trauma, such as cuts, scratches, or surgical incisions.
Lichen Planus: This is true. Lichen planus is another condition in which Koebner’s phenomenon is commonly observed. New lesions can develop at sites of trauma or injury.
Herpes: This is incorrect. Herpes simplex virus infections, while they can cause localized lesions, are not typically associated with Koebner’s phenomenon. Herpes lesions tend to follow a more localized and viral path rather than being induced by mechanical trauma. Thus, the correct answer is Herpes (4), as it is not typically associated with Koebner's phenomenon.