Seen in Pityriasis versicolor :
Scraping the surface of the lesions in Pityriasis versicolor will accentuate the scaling. This sign is known as Coup D'ongle sign of Besnier (Coup D'ongle means "Stroke of nail") Iris or target lesions Erythema multiformie Bulla spread sign and Nikolsky's sign Pemphigus vulgaris. Auspitz sign Plaque psoriasis Darrier's sign Uicaria pigmentosa. White dermographism Atopic dermatitis. Dimple sign Dermatofibroma.
Iris lesions
Auspitz sign
Coup D'ongle sign
Darrier's sign
Fungal infections