The Woronoff zone surrounding the psoriatic plaque.

[1]  V. Ziboh,et al.  Pathogenesis of Woronoff ring in psoriasis. , 1976, Archives of dermatology.

[2]  J. Doyle,et al.  A CASE REPORT ON THE PSORIATIC SPARING OF A DRUG REACTION , 1975, The Australasian journal of dermatology.

[3]  P. V. D. van de Kerkhof,et al.  Expression of endoglin in the transition between psoriatic uninvolved and involved skin. , 1998, Acta dermato-venereologica.