Differential diagnosis of auricular inflammation
Cellulitis, perichondritis
Otitis externa
Tuberculosis
Leprosy
Congenital syphilis (in neonates)
Frostbite
Sunburn
Insect bite
Sarcoidosis (lupus pernio)
Granulomatosis with polyangiitis
Relapsing polychondritis
Contact dermatitis
Cystic chondromalacia
Chondrodermatitis nodularis helicis
Data from Damiani and Levine.9