[Blaschkolinear eruption with biological signs of lupus]. / Eruption blaschko-linéaire avec biologie lupique.

ABSTRACT

INTRODUCTION: Acquired inflammatory dermatoses of the adult with a blaschkolinear arrangement are rare. Their cause is unknown. CASE REPORT We report the case of a 35-year-old man who presented an unilateral skin eruption covering the forearm and with secondary blaschkolinear extension to the arm, the axillary region and the chest. In this particular case, the patient was positive for RNP type anti-nuclear antibodies and direct immunofluorescence was positive in both biopsies of the lesions and of healthy skin. The eruption lasted 6 months and regressed spontaneously. DISCUSSION: Such cases are exceptional and the nosology is difficult to establish. A particular form of lupus erythematosus? Fortuitous coexpression of lupus antibodies and blaschkitis in an adult?