Itchy back papules with a white, flaky scale

A boy aged 23 months presented with red and itchy papules on his back. The papules were 0.5 to 1.0 cm in diameter, and some were covered with a shiny, white, and flaky scale.

The lesions started one week earlier and partially spread to his torso, limbs, and scalp. Some blisters developed into vesicles that dried up without ever opening. ...