Inflamed  lesions are either superficial  papules and pustules or deep pustules, nodules or cysts.

  Superficial papules and pustules vary in size from 0.1 cm with minimal erythema to 0.5 cm with a marked flare. The smaller, less inflammatory  lesions are referred to as  'less active papules or  pustules', the larger erythematous lesions as 'active papules  or pustules'. Some 40  per cent  of lesions fall between these two types,  but again are defined for  practical  purposes according to the major component.

  Deep lesions  are  predominantly nodules  and  are 0.5 cm or larger.  Some  deep lesions have  a major pustular component and are then referred to as deep pustules.