What is furuncle differential?

• Other infectious folliculitis: ->fungal: dermatophytes (kerion of the scalp: inflammatory dermatophyte, folliculitis to pityrosporum), Candida albicans, ->gram-negative bacillae • Pseudofolliculitis (non infectious): Crohn's disease, eosinophilic folliculitis • Hidradenitis suppurativa (Verneuil's disease): chronic inflammation of the pilosebaceous follicles and sweat glands in areas rich in apocrine glands (axillary, sub- mammary and anoperineal folds) • Epidermal inflammatory cyst or superinfected cyst: Preexisting cyst (face)