ABSTRACT
Bruno Bloch continued and expanded the work of Josef Jadassohn; thus PT has been referred to as the Jadassohn-Bloch technique. Contact Dermatitis (CD) is a common skin disorder marked by erythematous, vesicular, papular or lichenified pruritic skin lesions. It is caused by direct contact of an agent to the skin. It can be caused either by irritant triggers in 80% of patients versus allergic triggers in the remaining 20% of patients. Allergic Contact Dermatitis (ACD) is a cutaneous reaction caused by a type 4 cell-mediated reaction to an allergen; the reaction will recur with subsequent re-exposure to the same or cross-reacting allergen. Irritant Contact Dermatitis (ICD) is caused by non-immunologic direct tissue activation. Skin lesions can vary from erythematous papules, vesicles or bullae in acute reactions to more subtle lesions featuring lichenification, scaling, crusting and excoriations in chronic or sub-acute forms.
