Photodermatoses is a heterogeneous group of diseases resulting from abnormal skin hypersensitivity to sunlight and presented as local or generalized rashes. Specific sensitivity of children's skin to ultraviolet is often the first sign or clinical symptom of photodermatosis. Abnormal photosensitivity can be represented by diverse group of primary idiopathic conditions or photo-mediated aggravation of existing dermatosis. Number of genetic genodermatoses, metabolic disorders and connective tissue diseases is also widely known. These conditions can manifest with photosensitivity associated to other extracutaneous clinical and laboratory features. Timely diagnosis of photosensitivity in childhood allows to minimize long-term complications associated with insufficient photoprotection.

Skin is the natural habitat for complex bacterial, fungal, and viral communities (ecosystems). The microbiome of such communities is always in close relationship with the host genome, and the development of these ecosystems happens under the effects of morpho-physiological and immunological characteristics of the skin (sebaceous glands concentration, humidity, and temperature) and environmental factors. Metagenomic studies have shown significant diversity in skin ecosystems. Moreover, the role of commensal microorganisms in skin immune response modulating to various agents and, thus, its correlation with skin diseases pathogenesis is no longer in doubt. New probiotic and antimicrobial agents for external treatment have been developed according to these knowledges.

Atopic dermatitis (AtD) is multifactorial inflammatory skin disease with high prevalence in pediatric population. It is crucial to implement long-term maintenance therapy to prevent AtD exacerbations according to current clinical guidelines and expert reports. The article summarizes the results of the major studies on using pimecrolimus 1% cream. Its efficacy and safety in long-term proactive therapy of children with AtD are presented.

Healthy newborn skin care is challenging task. The basic principles of care should be taught to both medical staff and parents. This care is more crucial in children with atopic dermatitis who have abnormal skin acidity due to multifactorial exposure. Significant pH reduction leads to aggravation of the skin process that requires active therapeutic measures. The article presents guidelines for the first infant's skin cleaning, for conducting first and daily bathing, for using cleansing agents and daily care solutions to prevent skin acidity disorders and the development of atopic dermatitis.

Atopic dermatitis (AD) is a disease characterized by chronic skin inflammation and epidermal barrier dysfunction leading to decrease in patients' quality of life. AD is widespread in general population including children. This article covers the disease pathophysiological mechanisms including those that depend on the endotype, as well as core principles of systemic therapy for children with moderate and severe AD. Features of targeted therapy of such patients with dupilumab (IL-4 and IL-13 inhibitor) are presented. The studies' results on dupilumab efficacy and safety in the short- and long-term are shown.

Background. Patients with epidermolysis bullosa (EB) have higher risk of developing infectious diseases. Its prevention requires timely vaccination. For now, there are no studies showing vaccination coverage for this category of children. Objective. Our aim was to study vaccination coverage of children with EB according to national preventive vaccination programmes. Methods. This retrospective cross-sectional study examined medical records of patients with EB from Russian Federation and neighbouring countries. Vaccination coverage (completeness and timeliness) and age of immunization initiation were analyzed. Moreover, we have studied the spectrum of early post-vaccine reactions and the course of the post-vaccine period in children with EB vaccinated for the first time. Results. The study included medical records of 134 patients with EB aged from 8 months to 17 years 8 months. Vaccination was performed according to national immunization programs in 37 (28%) children, only 21 cases were carried out in a timely manner. Medical exemptions were the major reason for the refusal of vaccination in most cases (82%). 48 patients with EB were vaccinated against 12 vaccine preventable diseases in the hospital. The post-vaccine period was asymptomatic in 36 (76%) patients, 10 (20%) patients had tenderness and hyperemia at the injection site, 2 (4%) patients had subfebrile fever. Conclusion. Most children with EB are still unvaccinated or vaccinated untimely. Immunization of such children against vaccine preventable disease according to the individual plan can be pretty useful.

Background. Celiac disease (gluten enteropathy) is relatively rare disease. However, such patients have higher risk of skin pathology than general the population, and their therapy efficacy is limited by the use of gluten-free diet. Therefore, screening of dermatologic patients on celiac disease may be relevant. Objective. Our aim was to study the prevalence of celiac disease among children with skin pathology. Methods. The study included children hospitalized in dermatology department. Screening for celiac disease included detection in blood serum of antibodies (IgA, IgG, IgM) to tissue transglutaminase via rapid tests. In case of positive result of rapid test, we have repeated the estimation of antibodies (IgA, IgG) to tissue transglutaminase via immunochemiluminescent method with ImmunoCAP technology or via enzyme immunoassay. In case of positive serological test, we have performed HLA typing to determine haplotypes of DQ2 and DQ8, as well as esophagogastroduodenojejunoscopy (EGDJS) with biopsy of the duodenal and jejunal mucosa for further histological verification of the diagnosis. Results. We examined 1,000 children with various dermatologic pathologies. Rapid tests showed positive result in 21 patients (2.1%; 95% C11.3-3.2%). The presence of antibodies to tissue transglutaminase was confirmed via additional serological examination in all cases. HLA-haplotypes DQ2/8 were revealed in all patients with positive rapid test results. Typical form of gluten enteropathy was confirmed in 18/21 patients (86%) according to a histological study, thus, estimated prevalence of celiac disease is 1.8% (95% C11.1-2.8%). Conclusion. The prevalence of celiac disease remains underestimated among children with skin diseases. More studies are needed on the diagnostic features of rapid tests on tissue transglutaminase, as well as the benefits of screening for celiac disease to achieve patient-relevant clinical outcomes of skin pathology with wider gluten-free diet.

Background. Children with congenital epidermolysis bullosa (CEB) can have vitamin D deficiency due to its malabsorption in intestine and reduced synthesis in skin as these patients have restrictions on staying in the sun. However, the prevalence of vitamin D insufficiency/deficiency among patients with CEB remains not fully studied due to the small samples' sizes in previously studies. Objective. Our aim was to study vitamin D provision in children with CEB. Methods. The study included children aged from 3 to 18 years old with simplex and dystrophic types of CEB hospitalized in our department. The serum level of 25(OH)D was determined via chemiluminescence immunoassay. Vitamin D deficiency was established at 25(OH)D concentration of 20-30 ng/ml, deficiency — < 10-20 ng/ml, deep deficiency — < 10 ng/ml. Results. The study included 129 children with CEB (62 (48%) males, median age 6 (3; 10) years). 101 patients had dystrophic type of disease, 28 — simplex. The median 25(OH)D serum concentration in children with CEB was 21.7 (13.0; 36.6) ng/ml. Vitamin D insufficiency was revealed in 36 (28%) patients, deficiency — in 38 (29%), deep deficiency — in 16 (12%). Independent predictors of 25(OH)D concentration were the type of CEB (concentration was higher in children with simplex type) and age (negative association), but not the patients' gender and the examination season, according to multivariate regression analysis. Conclusion. The study has shown low level of vitamin D provision in children with CEB, whilst 25(OH)D concentration depended on the type of disease and the age of patients.

Background. This article discusses issues of diagnosis and management of pustular psoriasis in a child associated with recurrent dermatomycosis, immunopathogenetic mechanisms of pustular psoriasis, its course and prognosis. Clinical Case Description. The clinical case of infiltrative-suppurative form of scalp microsporia in 11 years old child with long-term psoriasis vulgaris and its transformation to generalized pustular psoriasis (von Zumbusch) is described. The need of immunosuppressive therapy prescription for severe psoriasis was challenged with fungal skin infection as immune suppression would lead to its recurrent course. Conclusion. Combination treatment (systemic glucocorticosteroids, methotrexate, antibiotics, and griseofulvin) resulted in clinical and laboratory recovery for microsporia in a child with generalized pustular psoriasis.

Background. Infantile hemangiomas are revealed in 1-3% of newborns and 10-12% of infants. There are only anecdotal reports on the laser therapy efficacy in this pathology management. However, there is no common approach to the use of this method in the complex treatment of infantile hemangioma in infants. Clinical Cases Description. Two clinical cases of infantile hemangioma are presented. Patients underwent complex treatment: systemic propranolol and laser therapy via pulsed dye laser. Laser exposure modes ware selected individually: laser spot sizes were 10 and 12 mm, energy levels were 5-10 J/cm², burst duration was short (0.45 ms) or long (10-20 ms), procedure duration was from 15 to 40 minutes, number of procedures varied from 1 to 8. Laser therapy has shown its efficacy in treatment of superficial infantile hemangioma. Conclusion. The indication for using laser therapy in management of infants with hemangiomas is especially persistent residual signs such as telangiectasias and erythema after spontaneous or drug involution phase. Laser therapy allows us to avoid aggressive methods and improves the quality of life of our patients according to this article.

Psoriatic arthritis is pending issue in modern pediatric dermatology. This review highlights issues of epidemiology, clinical signs, classification, diagnosis, management of comorbid conditions of psoriatic arthritis, as well as social aspects of the disease.

Acne is a common chronic inflammatory skin disease in adolescence. The involvement of cosmetically important zones inevitably leads to decrease in our patients' quality of life. This review considers modern methods of skin microbiota analysis, describes the microorganisms' composition in newborns and its changes during growing-up. Cutibacterium acnes (that dominates in the microbiota of skin areas with sebaceous glands) role in acne pathogenesis is described.

Atopic dermatitis (AtD) is multifactorial inflammatory skin disease, one of the aspects of its pathogenesis is epidermal barrier dysfunction. Early development of AtD is associated with filaggrin dysfunction. Filaggrin is a protein involved in aggregation of keratin filaments in the upper layers of epidermis and the retention of lipids and proteins between corneocytes. Frequently, filaggrin dysfunction can be accompanied with secondary infection and high risk of other allergic diseases development. This can happen due to disturbance in terminal differentiation of epidermal cells and, as consequence, malfunction of epidermal barrier. Thus, the long regular use of emollients is the basis of AtD therapy. New class of emollients (“emollents plus”) allowed us to achieve more significant treatment results in patients with AtD. These emollients reduce inflammatory process activity in the skin by replacing structural components of abnormal epidermal barrier.

The spread of new coronavirus infection (COVID-19) changes specialists' approaches to patients with chronic diseases, including those with chronic dermatoses. The high risk of COVID-19 complications in patients with psoriasis is connected to the features of disease pathogenesis (such as high activity of proinflammatory cytokines) and used immunosuppressive therapy. Psoriasis affects up to 1% of children in Europe, while 10-20% of them have moderate or severe form of disease. These children may require immunosuppressive treatment, including genetically engineered biological therapy. There is only limited data on adults and children with psoriasis during the COVID-19 pandemic.

The article shows the key role of IL-17 in the psoriasis pathogenesis and the opportunities of its management via monoclonal antibodies product secukinumab. The review of international randomized trials on clinical efficacy and safety of genetically engineered biologic drug secukinumab in children and adolescents with psoriasis is presented. During treatment periods of 12 to 52 weeks, secukinumab has shown high therapeutic efficacy for psoriasis severity and skin lesion areas and has improved quality of life of children and adolescents according to dynamic assessments of PASI, IGA 0/1 mod 2011 indices, CDLQI questionnaire. The safety profile of secukinumab in children is estimated as favorable and comparable to using it in adults.

Background. There is a need to study genetically engineered biological therapy (GEBT) survivability and identify any significant risk factors for its ineffectiveness due to the increasing prevalence of psoriasis among children and the spreading GEBT administration. Such information has practical importance, it can be used to predict treatment outcomes and to develop individual therapeutic approaches. Objective. Our aim was to study biological therapy survivability and to identify risk factors for its ineffectiveness in children with moderate and severe forms of psoriasis. Methods. The study included data from 4-17 years old patients with moderate and severe forms of psoriasis vulgaris. Groups were formed according to the biological medication used. Statistical analyses were performed via SPSS Statistics. Biologic therapy survivability was determined via Kaplan-Meier method with the assessment of differences significance using log-rank test. Significant factors affecting cumulative risk growth were determined by Cox multiple regression method. Results. The study analysed data from the medical records of 105 patients. The average survivability of ustekinumab was 28.7 months, etanercept — 23.1, and adalimumab — 18.4. In the group of bio-naive patients, the survivability was higher: 30.8 months for ustekinumab and 24.4 months for ethanercept, while in the group of patients administrated previously with biological medication the survivability was 24.2 and 8.3 months, respectively. No statistically significant difference was revealed for adalimumab therapy. Significant risk factors for therapy ineffectiveness were the following: high body mass index (BMI) at the time of GEBT onset, aggravated family history, and prior use of one or several subsequent GEBT lines. Conclusion. The therapy survivability is inevitably declining over time. The best results were noted in bio-naive patients treated with ustekinumab that allows us to recommend it as the first-line drug in children with severe and moderate forms of psoriasis.