Lichen planus is a rare disorder in infants and children where it usua
lly has the classical cutaneous pattern and only exceptionally involve
s the mucosa and skin appendages, A 9-year-old boy was referred to our
department with a 4-month history of erythematous keratotic papules o
n the trunk and the upper and lower limbs. There were no signs of muco
sal involvement, Subsequently white papules and striae, occasionally f
orming a lace like pattern, appeared on the penis and prepuce which qu
ickly led to phimosis necessitating circumcision. Histologic examinati
on of skin biopsy specimens and genital mucosa fragments confirmed the
clinical diagnosis of lichen planus.