What causes Pityriasis lichenoides et varioliformis acuta ?
What causes pityriasis lichenoides et varioliformis acuta? The exact underlying cause of pityriasis lichenoides et varioliformis acuta (PLEVA) is unknown. Some scientists suspect that it may occur due to an exaggerated immune response or hypersensitivity to an infection. Some of the infections that have been associated with PLEVA include: Toxoplasma gondii    Epstein-Barr virus HIV Cytomegalovirus Parvovirus (fifth disease) Staphylococcus aureus Group A beta-haemolytic streptococci Others scientists think the condition may be a benign lymphoproliferative disorder. These conditions are characterized by an overproduction of certain white blood cells (lymphocytes) which can result in tissue and organ damage.