Pseudoainhum in psoriasis

Congenital bands caused by umbilical cord; [3]Acquired constricting bands secondary to trauma, mechanical injury, infection and specific disease;Factitial constriction by hair, threads and fiber, common in children and mentally retarded persons. [4],[5] Nonhereditary disease includes vascular abnormalities (Raynauds disease, diabetes mellitus and linear scleroderma) systemic sclerosis, sensory changes (leprosy, tertiary syphilis and syringomyelia), ergot poisoning, spinal cord tumors, or scar formation (burn, frostbite and trauma).