[Unilateral neck inflammation in psoriasis].

Local inflammation and systemic symptoms such as fever, fatigue and loss of appetite suggest the diagnosis of an abscess even if the patient is in a good general physical condition. The site of bacterial penetration should be identified along the corresponding lymphatic vessels. In this case, periauricular scratching induced by severe psoriasis led to a cervical abscess, the causing bacteria were identified as Streptococcus pyogenes.