Condition	Characteristics
Bacterial folliculitis	Follicular papulopustules, usually secondary to Staphylococcus aureus infection; more severe cases may lead to furuncles, carbuncle, and abscess
Bullous impetigo	Usually occurs in children and immunocompromised adults; bullae characterized by yellow fluid that becomes turbid and sometimes pustular; light brown or golden yellow crusting
Pemphigus vulgaris	Generally occurs in persons older than 40 years; mucosal and cutaneous erosions and blisters; autoimmune disease with autoantibodies; positive results on direct immunofluorescence
Pustular psoriasis	Can occur at any age; extensive small sterile pustules on an erythematous base; occasionally annular configurations; triggered by pregnancy or rapid corticosteroid tapering; personal or family history of psoriasis is common
Subcorneal pustular dermatosis	Most common in women older than 40 years; small pustules that appear in crops over the trunk and proximal extremities and that often coalesce in annular, circinate, or serpiginous patterns