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Introduction. Plasma cell mucositis (PCM) is a rare condition consisting of plasma cell infiltrate of the mucous membranes that usually involves the genital epithelium. Less frequently lesions are present in the mouth or upper respiratory tract. The etiology of PCM remains unknown. The lesions may occur in the unchanged epithelium (idiopathic, isolated PCM), on the base of inflammatory skin diseases (lichen planus, lichen sclerosus) or cancer (squamous cell carcinoma). Objective. To present a case and draw attention to PCM as a differential diagnosis of lesions within the oral mucous membrane. Case report. We present a patient with painful erosions and erythematous patches located within the mucous membrane of the palate and cheeks lasting more than 5 months. The diagnosis was based on clinical and histopathological examination. Conclusions. The course of PCM includes periods of exacerbations and remissions. Treatment with antibiotics, antifungal agents, local and systemic corticosteroids, isotretinoin or destructive methods usually provides symptomatic relief but does not lead to lesions regression.

Staphylococcus aureus ( S. aureus ) is a Gram-positive bacterium capable of causing various diseases, from skin infections to life-threatening necrotizing pneumonia, bacteraemia, endocarditis and toxic shock syndrome. Methicillin-resistant Staphylococcus aureus (MRSA) is endemic in hospitals worldwide and is a major cause of human morbidity and mortality. Healthcare-associated MRSA (HA-MRSA) infections occur in individuals with a compromised immune system and people with prior surgery. Community-associated MRSA (CA-MRSA) infections often occur in healthy individuals and are epidemic in some countries, which may suggest that those strains are more virulent and transmissible than HA-MRSA. According to the Center for Disease Control and Prevention, a case of MRSA infection is community acquired when it is diagnosed in an outpatient or within 48 hours of hospitalization if the patient lacks the following traditional risk factors for MRSA infection: receipt of hemodialysis, surgery, residence in a long-term care facility, or hospitalization during the previous year; the presence of an indwelling catheter or a percutaneous device at the time culture samples were obtained. Although progress has been made toward understanding emergence of CA-MRSA, virulence factors and treatment options, our knowledge remains incomplete. The recent occurrence of CA-MRSA in addition to the widespread problem of MRSA in hospitals has underlined the high urgency to find novel treatment options for drug-resistant S. aureus .