ABSTRACT
The main papular acantholytic dermatoses include Grover’s disease, Darier’s disease and papular acantholytic dermatosis of the genitocrural area (PADGA). Papular urticaria (PU) is a frequent condition due to a hypersensitivity reaction to the bites of several insects, such as mosquitoes, sandflies, fleas and bedbugs; it is more common among children. Dermoscopy may be helpful to show the central haemorrhagic punctum corresponding to the site of the insect bite or display one or multiple haemorrhagic spots representing extravasated erythrocytes in the dermis. Prurigo nodularis (PN) is a chronic condition whose lesions are induced by skin picking and scratching. The dermoscopic hallmark of PN consists of peripheral, radial, white striae over a brownish background. Acquired perforating dermatoses (APD) manifest as itchy, round, umbilicated, skin-coloured or hyperpigmented papules and nodules having a central crust or keratotic plug, most commonly involving the extensor surfaces of the extremities and the trunk.
