An exanthem is a skin rash that may be associated with mucous membrane eruption, fever or other symptoms. It may develop as manifestation of an infectious disease or as adverse reaction to drugs. Beside the 'classical exanthems' commonly occurring in childhood, other exanthems, defined as 'atypical' for the different morphology and causal agents, may occur. Among the atypical exanthems with infectious etiology, viral, bacterial, parasitic and helminth infections are implicated. We describe herein etiology and epidemiology of the atypical exanthems caused by infectious agents. In case of exanthem, to make a correct etiological diagnosis is crucial for both the patient and community concerning issues such as time off school, immunizations and risk in pregnancy and immunocompromised individuals.

Worldwide, 500 million people a year acquire a sexually transmitted disease (STD). Adolescents, accounting for 25% of the sexually active population, are the most affected. To analyze sexual behavior among Italian adolescents and their knowledge of STDs, with the goal of preventing their transmission, a questionnaire was administered to 2867 secondary school students (1271 males and 1596 females) aged 14–21 years. For the study, 1492 students were interviewed in Genoa (Northern Italy) and 1375 in Lecce (Southern Italy). For 37% of the respondents, parents and teachers were the main source of information on sex, and 95% believed that school should play the primary role in sex education. However, only 9% considered the sex education they received in school good. Noteworthy, only 0.5% of the teenagers recognized the sexually transmitted diseases from a list of diseases, and 54% of them did not know what a Pap test was. Confusion about the meaning of contraception and prevention was evident; only 22% knew that condoms and abstinence are the only methods for preventing STDs. Finally, a consistent number of students are exposed to risk factors for STDs transmission; e.g., alcohol and recreational drug use, promiscuity and improper condom use. On the basis of our study, there is an urgent need for the introduction of sex education as a proper subject in Italian schools.

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Erosive pustular dermatosis of the scalp induced by ingenol mebutate Editor Erosive pustular dermatosis of the scalp (EPDS) is a rare entity that develops in sun-damaged scalp skin of elderly people with alopecia and/or multiple actinic keratoses (AKs).1 It is often triggered by local trauma such as surgical procedures, skin graft, hair transplantation or physical and chemical procedures for AK including, cryotherapy, radiation therapy, laser therapy, topical retinoid, imiquimod and photodynamic therapy.

Psoriasis has been controversially associated with risk of non-Hodgkin lymphoma (NHL) and mycosis fungoides (MF). Also patients who developed MF after systemic treatment for psoriasis have been reported, and some authors suggested that the association between MF and psoriasis is not infrequent. We performed an extensive literature review in order to examine the risk of developing MF in psoriatic patients with a systematic search of the English-language databases. An increased risk for lymphoma overall in psoriatic patients has been found only by three out of seven studies. The risk of developing MF in psoriatic patients has been investigated by different studies in different populations and with different methodologies presenting bias and limitations, and it seems reasonable that misclassification between psoriasis and MF may explain the association reported. In contrast to the large number of psoriatic patients treated with biologicals, only 27 case reports of MF after biological therapy for psoriasis have been reported, and in 10 cases, the initial psoriasis diagnoses were then revised as MF. A true association between MF and psoriasis is possible, but the real incidence and prevalence are still unknown. The reported higher risk of developing MF in psoriatic patients should be reconsidered in the light of the bias of misclassification and the low magnitude reported in previous studies. There is not enough evidence to support a causal relation among biological therapies and MF in psoriatic patients.

Highlights An enanthem is a mucosal eruption that precede, follow or occur simultaneously with an exanthem. Enanthems may be triggered by an underlying infection or a drug received by the patient or both. Patterns are: vesicular, macular, maculo-papular, maculo-papular-petechial, and petechial. Erythemato-vesicular and petechial patterns are the most frequent in adults. Some enanthems are pathognomonic for a disease as Koplik's spots for measles.

Actinic keratoses (AKs) are common dysplastic lesions resulting from chronic excessive ultraviolet exposure. Neither the clinical grade of thickness nor the histological grade of dysplasia seems valid predictors of aggressive potential of AKs. Instead, the mutational status in AKs appears to predict well the clinical course. TP53 gene mutations result in a non-functional protein resistant to degradation, thus immunohistochemical staining for p53 can suggest mutation status. Increased p53 was associated with progression from AK to squamous cell carcinoma. To investigate how the intensity of p53 staining (p53 staining index) varies according to body site, histological subtype and grade dysplasia of AKs. Secondly, we sought to investigate the distribution in the epidermal layers of non-functional p53 (zonal staining patterns). p53 staining index was greater than 50% in 90.7% of AKs. p53 staining index was significantly higher in older age (p < 0.0093) and in facial AKs compared to other body areas (p = 0.03). A significant correlation between p53 staining index and grade of dysplasia was observed (p = 0.006) and between p53 staining index and zonal p53 staining pattern (p = 0.003). No significant differences in p53 staining index among the various histological AK types were observed. No correlation between clinical and histological grade. All AKs, independently from their clinical appearance, should be treated but special attention is required for AKs on severely photodamaged skin on the face and in older patients.