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Prurigo nodularis (PN), also known as nodular prurigo, is a skin disorder characterized by pruritic , nodular lesions, which commonly appear on the trunk, arms and legs. [1] Patients often present with multiple excoriated nodules caused by chronic scratching.
Dogs with the condition often present with erythema. The axillae, ventral abdomen, distal extremities, inner pinnae; and periocular, perioral, and perianal regions are commonly affected. Pruritus and inflammation may result in self-induced alopecia and excoriation. Otitis externa is present in half of all dogs with atopic dermatitis. [5]
Prurigo is a reactive skin condition distinguished by numerous, isolated itchy papules. [1] The word "prurigo" comes from the Latin word pruire, which meaning itching. Ferdinand von Hebra coined the term "prurigo" in Vienna in 1850 to describe papules and nodules that had severe pruritus. [2]
[19] [20] Clinically, the diagnosis of any particular skin condition is made by gathering pertinent information regarding the presenting skin lesion(s), including the location (such as arms, head, legs), symptoms (pruritus, pain), duration (acute or chronic), arrangement (solitary, generalized, annular, linear), morphology (macules, papules ...
Dupilumab is the first treatment for prurigo nodularis approved by the FDA. [10] Prurigo nodularis is a rare skin disease that causes hard, itchy lumps (nodules) to form on the skin. [ 10 ]
Lichen simplex chronicus (LSC) is thick leathery skin with exaggerated skin markings caused by sudden itching and excessive rubbing and scratching. [1] It generally results in small bumps, patches, scratch marks and scale. [1] It typically affects the neck, scalp, upper eyelids, ears, palms, soles, ankles, wrists, genital areas and bottom. [1]
Cholestatic pruritus is the sensation of itch due to nearly any liver disease, but the most commonly associated entities are primary biliary cholangitis, primary sclerosing cholangitis, obstructive choledocholithiasis, carcinoma of the bile duct, cholestasis (also see drug-induced pruritus), and chronic hepatitis C viral infection and other forms of viral hepatitis.
Chronic scratching of lesions can cause thickening or lichenification of the skin or prurigo nodularis (generalized nodules that are severely itchy). [34] Another factor in the barrier failure and immunological dysregulation in people with atopic dermatitis may be due to decreases in tight junction protein Claudin-1.