<unk>  is of unknown cause. It is suspected to be an autoimmune disorder. It may be triggered by bites from insects such as mosquitos, spiders, fleas, or ticks, or from medications or surgery.
Eosinophilic cellulitis
Cellulitis
Tuberculous cellulitis
Vasculitis
Streptococcal intertrigo
Anaphylaxis
Folliculitis decalvans
Trombiculosis