Limpet-like cone-shaped lesions in psoriasis refers to:

Rupioid psoriasis refers to limpet-like cone-shaped lesions. The term elephantine psoriasis is used to describe persistent, thickly scaling, large plaques. Ostraceous psoriasis refers to a ring-like hyperkeratotic lesion with a concave surface, resembling an oyster shell. Ref: Rook's textbook of dermatology, 8th edition, Pg 20.12