A child is presenting with erythmatous follicular papules on trunk. There are areas of normal skin within the lesions. There is thickening of Palms & soles. This child is suffering from –: (A) Pityriasis rosea, (B) Pityriasis rubra pilaris, (C) Psoriasis, (D) Seborrheic dermatitis
Answer is B. Clues are :-


Erythmatous follicular papules
Involvement of trunk
Thickening of Palm and soles (Palmo-Planter keratoderma)
The most important one is presence of normal skin within the lesions


Diagnosis is nothing other than pityriasis rubra pylaris.