<prompt> Primary pyodermas are:Impetigo contagiosaEcthymaFurncleAll  <response>: A i.e. Impetigo contagiosa; B i.e. Ecthyma; C i.e. Furncle - Pyoderma gangrenosum PG is non infectious neutrophilic dermatosis commonly associated with underlying systemic disese like UC, Chrons etc. Pyostomatitis vegetans, malignant pyoderma, superficial vegetative granulomatous pyoderma, ulcerativepustularbullous erruptions of UC are variants of PG.Pyoderma faciale also ka rosacea fulminans or rosacea conglobata occurs mainly in adult women in 20s and is characterized by sudden, severe erruption of confluent papules, nodules, pustules, cystic swellings which may be interconnected by draining sinuses usually confined to face, involving checks, chin, nose forehead within a background of diffuse facial erythema. Comedones are usually absent or inconspicuous, as are other features of acne vulgaris or rosacea yet unclear whether this is a variant of these or a seperate entity. Some cases may develop during pregnnacy or medication interferon a-2B ribavirin therapy for hepatitis CImpetigo herpetiformis is variant of pustular psoriasisQ attributed to hormonal alterations during pregnancy generally during 3rd trimesterQ. Absence of positive family history, abrupt resolution of symptoms at delivery and a tendency to only recur during subsequent pregnancies distinguish this from generalized pustular psoriasis. Impetigo contagiosaQ, bullous impetigo, ecthymaQ, botryomycosis, superficial folliculitis follicular or Bockha impetigo, folliculitis sycosis barbaeQ, furncle boilQ, carbuncle, blistering distal dactylitis and paronychia are superficial primary pyodermas caused by staph.aureus. Whereas, impetigo, ecthyma, blistering distal dactylitis in noninteriginous skin and interigo, vulvovaginitis perianal cellulitis in inter triginous skin are superficial primary pyodermas caused by group A streptococci. Pyoderma gangrenosum, pyoderma faciale impetigo herpetiformis are not pyodermasQ.Trichomycosis axillaris pubis is a bacterial aerobic corynebacterium not fungal infection of hair shaft. Erythrasma is superficial bacterial infection of skin caused by corynebacterium minutissimumQ. 