This disorder is more common in women than in men and usually is evident by adolescence or early adulthood. The word histrionic means "dramatic or theatrical." They have an overwhelming desire to be noticed, and often behave dramatically or inappropriately to get attention. ![]() For people with histrionic personality disorder, their self-esteem depends on the approval of others and does not arise from a true feeling of self-worth. People with these disorders have intense, unstable emotions and distorted self-images. 1 A systemic antihistamine or antipruritic may help ease the itching.Histrionic personality disorder is one of a group of conditions called "Cluster B" or "dramatic" personality disorders. 5Ī potent topical corticosteroid may help reduce the intensity of the reaction but does little to hasten involution of lesions. Fresh allergen can be transmitted to other areas of the body by surface-to-surface contact and, within minutes, becomes fixed to skin, where the allergic reaction ensues.Ĭontaminated clothing and shoes should be washed with soap and water within a few minutes after exposure to remove the urushiol before it dries to prevent it from becoming antigenic indefinitely. 4Įxposed persons should wash thoroughly as soon as possible (within minutes of contact is best) to remove the oil from skin. When vesicles and bullae are prominent, poison ivy dermatitis must be distinguished from bullous impetigo, herpes simplex virus infection, and varicella infection. 3 Poison ivy can also be confused with insect bite, miliaria rubra, and contact dermatitis triggered by such allergens as sun block and fragrances. Linear lesions of poison ivy dermatitis can usually be distinguished from other dermatitic disorders, such as atopic dermatitis, which tend to be symmetric in distribution 3 and that present in characteristic age-related patterns. 2 The nature of the silver-white crust on this patient's lesions is uncertain. Black lacquer-like deposits that often appear within lesions when sap from any Toxicodendron species comes in contact with dry skin, and that are evident in this patient, are a reliable marker for this allergen. The eruption of poison ivy is characterized by pruritic red papules, vesicles, and bullae 1 that are usually linear or angulated, either because of the manner of exposure to the plant in woods or the backyard or because scratching transfers the urushiol to adjacent areas (Koebner reaction). Seventy percent of people in the United States demonstrate a genetic susceptibility to Toxicodendron dermatitis when they are exposed to the sensitizing oleoresin in plants' leaves, stems, and roots. The dermatitis results from a delayed contact hypersensitivity type-IV reaction to the oleoresin (urushiol), of which the active sensitizing ingredient is pentadecylcatechol.Ĭharacteristic lesions appear in susceptible children within one to three days after exposure, although they may develop as early as within 8 hours after exposure in a highly sensitized person. It flourishes in most regions of the continental United States, and is very common in some areas. ![]() Poison ivy, the likely culprit in this case, is a three-leaved tall shrub or woody, rope-like vine that grows within grasses, on trees and fences, and in vacant areas. The causative plant and its relatives (including the commonly named poison oak and poison sumac) are classified under the botanical genus Toxicodendron but are sometimes included in the genus Rhus-hence the term " Rhus dermatitis" that is also used. Poison ivy dermatitis is a major source of contact allergy in children, particularly during the summer. Diagnosis: Poison ivy ( Toxicodendron radicans) dermatitis
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