A young boy presented to OPD with multiple shiny pinhead size white papules over dorsum of hand, forearm and penis. What would be the diagnosis?

lichen nitidus-monomorphic eruption of asymptomatic minute skin coloured shiny papules common sites- forearm, penis,buttocks, lower abdomen and chest age- common in children and young adults histopathology- claw clutching ball appearence rx- self limitingtopical steroids,PUVA,NBUVB,Systemic steroids. scabies - erythematous papules in web spaces, axilla, groins involving circle of hebra lichen planus- violaceous flat topped papules. molluscum contagiosum- pearly papules with central umbilication. IADVL textbook of dermatology page 1082.