Classic, Type I PRP is characterised by orange-red plaques with fine scale, which develops over weeks-to-months in a rostrocaudal fashion. Typical features which may differentiate it from psoriasis include keratotic follicular papules and ‘islands of sparing’, referring to areas of uninvolved normal skin interspersed between otherwise generalised plaques. (130) Erythroderma (with >90% body surface area involvement) and waxy yellow scaling of the palms and soles (palmoplantar keratoderma) may also develop.