The clinical advantages of light-emitting diode (LED) therapy in skin healing and its underlying mechanism remain subjects of ongoing debate.

The month of January 1925 marks the birth of the Annaes Brasileiros de Dermatologia e Syphilografia and currently, 100 years later, with great merit, we celebrate its evolution into Anais Brasileiros de Dermatologia (ABD). Indeed, those few brilliant pioneers never dreamed of the strength of the Brazilian Society of Dermatology nowadays. However, perhaps they envisioned a relevant role for ABD, with a natural space for dermatoses of infectious etiology, always prevalent in tropical and subtropical regions. And thus, it was established for decades. Currently, Brazilian Dermatology and ABD are plural and open to the different facets of Dermatology. However, both the specialty, Dermatology, and its official body, ABD, value and pay homage to history, and cannot forget or stray from it. Numerous challenges have been faced over the past 100 years. Many other challenges still remain, but it is up to us, as a gift to the 100 anniversary of the Anais Brasileiros de Dermatologia, to learn about them and reflect on them. The following text provides a summary of the history of ABD over the years. We invite national and international readers to celebrate with us.

Cryptococcosis is a disease caused by fungi of the genus Cryptococcus, with the species Cryptococcus neoformans and Cryptococcus gattii being recognized as pathogenic. Cutaneous cryptococcosis can be classified as "secondary", developing from a previous systemic disease, or, on the contrary, "primary", resulting from transcutaneous inoculation of the agent. It can also be classified as "disseminated cutaneous cryptococcosis", when there is an associated systemic disease, or "localized", when it is restricted to the skin. This article uses the term "primary cutaneous cryptococcosis" because it is the most widely used and already established in the literature. Historically, the first report of a possible case of primary cutaneous cryptococcosis (PCC) occurred in 1950 by Gancy WM and was published in the Archives of Dermatology. Subsequently, the rare and sporadic reports in the following decades were reviewed and reported in the 1985 publication by Baes & van Cutsen. However, the unequivocal acceptance of the existence of PCC as a distinct disease only occurred in 2003 with the publication by Neville S et al. of the French Cryptococcosis Study Group. The fundamental criterion established to consider it as PCC was the proven absence of systemic disease, whether pulmonary, in the CNS or other location at the time of diagnosis of the cutaneous condition, characterized by a single lesion and, mostly, in an exposed area. These and other clinical criteria, diagnostic confirmation, and therapeutic choice are discussed in detail in the full text.

Human hair, particularly on the scalp, serves as a significant aspect of social identity and well-being. The exposome, encompassing both intrinsic and extrinsic factors, plays a fundamental role in hair weathering. Intrinsic factors include genetic predispositions and physiological changes within the body, while extrinsic factors comprise environmental exposures such as UV radiation, pollution, humidity, temperature variations, lifestyle choices, and chemical treatments. These elements collectively contribute to the cumulative damage experienced by hair over time. Understanding the comprehensive impact of the exposome on hair health and hair aging necessitates an exploration of various environmental conditions, lifestyle factors, and technical artifacts. Despite advancements in research, the intricate mechanisms underlying the exposome influence on hair remain incompletely understood. Through a comprehensive review of current literature and emerging research findings, this study aims to enhance the understanding of exposome impact on hair health.

Cancer is an important cause of morbidity and mortality after solid organ transplants. Skin cancer is the most prevalent non-lymphoid malignancy occurring during heart transplantation follow-up. Due to the complexity of immunosuppressive therapy and the high prevalence and incidence of skin cancer in this population, dermatologists play an important role in the short and long-term follow-up of heart transplant recipients.

Drug-induced hypersensitivity syndrome, also known as DRESS syndrome, is a serious and potentially fatal reaction that occurs in response to prolonged use (generally between 14 and 60 days) of certain drugs, and which has no predilection for gender or age group. It is believed that DRESS syndrome has a genetic basis and results from the interaction between metabolites of certain pharmacological groups, reactivation of latent viruses (especially from the Herpesviridae family), and a cellular immune response. The classic manifestation of DRESS syndrome includes a generalized rash accompanied by fever, eosinophilia, lymphadenopathy, and systemic involvement such as hepatitis, nephritis, or pneumonitis. With the continuous increase in the availability of drugs and the aging of the population, there is a favorable scenario for the development of adverse drug reactions. Physicians should be prepared for the early diagnosis of DRESS syndrome, the identification and immediate suspension of the drug involved, and also manage systemic involvement, which may require prolonged immunosuppressive therapy. This article provides an update on the clinical, physiopathological and therapeutic aspects of DRESS syndrome.

Chronic spontaneous urticaria (CSU) is a clinical condition that affects patients quality of life. Omalizumab is preferred in antihistamines resistant CSU cases. Urticaria activity score-7 (UAS-7) is a scale that shows the severity of the disease.

Exosomes are extracellular nanovesicles secreted by several cells in the human and animal body. Consisting of a lipid membrane and encapsulated proteins, they contain biologically active substances such as proteins, DNA, RNA, transcription factors, and metabolites. Discovered in the 1980s, exosomes play an important role in cell-to-cell communication and immune function. They vary in size, content, and function depending on the cell of origin. Exosomes have attracted interest in the field of Dermatology due to their potential applications in the treatment of scars, skin rejuvenation, hair regeneration, and other dermatological conditions. However, further clinical studies are needed to prove their efficacy and safety. Regulatory issues also need to be considered, as the use of exosomes in cosmetics and medical treatments is not yet fully approved in some countries. Moreover, it is important to understand the risks and side effects associated with the use of exosomes before their clinical use. Although promising, more research is needed to explore the full potential of exosomes in Medicine and Dermatology.