Kobnèr’s phenomenon seen in all except:
A. Lichen plannusB. Vitiligo
C. Behcet syndrome
D. Psoriasis
Ans. C. Behcet syndrome
• Kobner response is the development of lesions in previously normal skin that has been subjected to trauma.Diseases showing this response are
- Erythema multiforme
- Hailey-Hailey disease
- Kaposi’s sarcoma
- Leukemia
- Lichen planus & sclerosus
- Necrobiosis liopoidica
- Peroforating collagenosis & folliculitis
- Psoriasis
- Vasculitis
- Vitiligo
- Xanthomas
• Kobner response is best not used to dermatosis that occurs due to spread of an infective agent like molluscum contagiousum or warts; for this phenomenon, the term pseudo-kobner is used.
• It is controversial whether it is appropriate to use the term Kobner phenomenon for the pustular response to injury in Behcet’s syndrome & pyoderma gangrenosum.
