Washington Barber License Practice Exam

Secondary skin lesions are a result of a primary lesion or an external factor affecting the skin. They can be classified into three groups based on their appearance or composition - scale, scar, and ulcer. The collection of "material" refers to the composition of these lesions, which can contain cell debris, fluid, or other substances. Option A is incorrect because pus is associated with infection and inflammation, mostly found in primary lesions. Option C is incorrect because while blood may be present in some secondary skin lesions, it is not a defining characteristic. Option D is incorrect because water is not a component of secondary skin lesions.