acute infection of pinna

An otitis externa which involves bacterial infections often related to underlying comorbidities as well as trauma. Common sources of trauma include ear piercing, boxing, blunt trauma, burns, bite wounds and iatrogenic insults. The common bacterial pathogens are staphylococcal and streptococcal species.

perichondritis of auricle

An otitis externa involving infection of the tissue surrounding the cartilage of the earlobe (pinna), ear canal, or both. It may be caused by injury, burns, insect bites, ear piercing, or a boil on the ear. The common bacterial causative agent is Pseudomonas aeruginosa. Symptoms include redness, pain, fever, swelling of the earlobe and pus accumulation between the cartilage and the layer of connective tissue around it.

cellulitis

A skin disease where there is a diffuse infection of connective tissue with severe inflammation of dermal and subcutaneous layers of the skin. Cellulitis can be caused by normal skin flora or by exogenous bacteria, and often occurs where the skin has previously been broken: cracks in the skin, cuts, blisters, burns, insect bites, surgical wounds, or sites of intravenous catheter insertion.