Mycoplasma pneumoniae-induced rash and mucositis: A new entity.

Mycoplasma pneumoniae is a well-known cause of community-acquired pneumonia, mostly associated with dermatological manifestations especially with mucosal involvement and targetoid cutaneous lesions. For many years, it was considered among the spectrum of erythema multiforme. Recently, some authors have recommended the creation of a new syndrome called "mycoplasma-induced rash and mucositis." This new syndrome has distinct epidemiological, clinical and histological features making it different from drug-induced Stevens-Johnson syndrome, toxic epidermal necrosis and erythema multiforme. Herein, we report two patients with acute Mycoplasma pneumoniae respiratory tract infection presenting severe mucocutaneous lesions in accordance with this new syndrome.

A comparative case-control study of diagnostic criteria for atopic dermatitis and proposal of new diagnostic criteria from Tunisia.

BACKGROUND: Atopic dermatitis (AD) is a heterogeneous disease. Thus, it is difficult to set up standard diagnostic criteria that cover the entire spectrum of AD patients. Our objectives were to study the epidemiologic characteristics of AD in Tunisia and to evaluate five diagnostic criteria (Hanifin and Rajka, Williams, Taieb and Boralevi, REACH and ISAAC questionnaire). METHODS: This prospective case-control study was carried out in our Dermatology Department in Tunisia. The cases and controls were collected over a period of one year (January 3, 2017, to January 2, 2018). RESULTS: We collected 101 patients with AD and 101 controls. Patients and controls were comparable by age and gender. The mean age of patients was 9 years and 9 months with sex ratio 1.02. Children accounted for more than half of the patients (61.39%). The sensitivity and specificity of the criteria were, respectively: 90.1% and 90.1% for the Hanifin and Rajka criteria, 53.47% and 96.04% for the Williams criteria, 62.50% and 92.3% for the Taieb and Boralevi criteria, 41.58% and 92.08% for ISAAC questionnaire, 49.5% and 91.09% for REACH questionnaire. A new version of AD diagnostic criteria has been proposed. By applying these new criteria retrospectively to our patients, the sensitivity rises to 90.1%. CONCLUSION: The new version of AD criteria is a practical diagnostic tool compared to the Hanifin and Rajka criteria and seems to correct the problem of low sensitivity of the Williams criteria. Large validation studies are needed.