Three distinct clinical stages have been defined for the condition.
Stage 1 – solitary or multiple, isolated abscess formation
without scarring or sinus tracts Stage 2 – recurrent abscesses, single or multiple widely separated lesions, with sinus tract formation
Stage 3 – diffuse or broad involvement, with multiple interconnected sinus tracts and abscesses.
Disease may spread to involve less commonly associated sites including the nape of the neck, waistband and inner thighs.