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This chapter discusses various substances and therapies for dermatological applications, including heliotherapy, UVB, khellin, and others, but reports no new research findings.

Herpes gestationis is linked to certain antigens, atopic eczema affects T cell populations and may be eased by breastfeeding, higher doses of anti-androgen treatment can improve androgenic alopecia, topical minoxidil increases hair thickness, long-term methotrexate therapy can cause liver fibrosis in psoriasis patients, and Lichen Sclerosus et Atrophicus patients aren't at higher risk for autoimmune disorders.

This study found that TPA treatment transiently induces high levels of ODC in mouse epidermal cells, particularly around hair follicles, with localization reduced by retinoic acid or cycloheximide pretreatment.

This study in a transgenic mouse model found that repressing overexpression of ornithine decarboxylase reduced papilloma development, indicating its role in tumor promotion sensitivity.

This study observed that dermal dendritic cells migrate to the epidermis in mouse tail and back skin, correlating with changes in epidermal physiology like ortho- and parakeratosis.

This study suggests that Merkel cell polyomavirus T antigen-positive cells resembling Merkel cell carcinoma may originate from epithelial cells in human hair follicles, potentially informing future transgenic mouse models for this cancer.

In this study, researchers observed that dormant TRP-2+ melanoma cells in bone marrow can interact with CD8+ T cells in tumor-bearing ret transgenic mice, potentially influencing immune responses.

This study reviews prior research using transgenic K6/ODC mice and demonstrates that elevated polyamines in epithelial cells contribute significantly to skin tumor development and progression by stimulating proliferation, altering cell signaling and chromatin remodeling, and affecting immune functionality, amongst other mechanisms.

This study suggests that chronic treatment with TPA in mouse skin selectively expands a keratinocyte subpopulation hyperinducible for ODC, which may be a key target for neoplastic transformation.

This study reported that overexpressing ornithine decarboxylase in C57Bl/6 mice increased their sensitivity to tumor promotion by TPA, a change reversible by doxycycline treatment.

Certain immune cells in atopic dermatitis skin could be targeted for treatment.

The study found that over-expressing ornithine decarboxylase in the outer root sheath of the hair follicle in mice increases UVB-induced tumor growth and invasive squamous cell carcinoma compared to inter-follicular epidermal keratinocytes.

This study used electron microscopy to identify a distinct dendritic cell in the human epidermis, similar to the melanocyte, with unique structural features and variable melanin content.

This article reviews the roles of dendritic cells in alopecia areata and highlights emerging precision therapies that target these cells, reporting no new experimental findings.

This study suggests that the presence and arrangement of plasmacytoid dendritic cells can help distinguish chronic cutaneous lupus erythematosus from other types of scarring alopecia.

This letter discusses three plasmacytoid dendritic cell-related parameters that may help differentiate lupus alopecia from lichen planopilaris, but it reports no new study results.

This study observed that dandruff is linked to a weakened immunoprivilege in hair follicles, with reduced Langerhans cells and increased epidermal CD4+ and CD8+ T cell infiltration.

This study analyzed blood samples from individuals with alopecia areata and found that NKG2D+ immune cells, particularly memory-like NK cells, may better correlate with disease activity compared to CD8+ cells, though significant variability among individuals complicates these findings.

This case report highlights two instances of suspected human herpesvirus 6 reactivation in patients with existing psychiatric disorders, underscoring the need for further research into the relationship between viral reactivation and psychiatric conditions.

This study found that plasmacytoid dendritic cells are central to the pathogenesis of alopecia areata, suggesting they may help differentiate it from trichotillomania and androgenetic alopecia.

This study found that plasmacytoid dendritic cells may initiate alopecia areata in mice by overexpressing interferon-alpha.

This study reported that high ornithine decarboxylase expression and decreased keratin K1 and K10 expression may serve as useful markers for early stages of tumor development in mouse skin.

This study examined dermoscopic features in African-American women with different types of alopecia and found that a perifollicular pink blush, potentially indicating inflammation, was common, particularly resolved with anti-inflammatory treatment, suggesting dermoscopy could aid in management.

This study found that mouse skin CD4(+) memory T cells are in equilibrium with the circulation under steady state but increase in specific clusters in response to infection or inflammation.

This study found that ITGA6-positive dermal sheath cup cells, identified by their superior migratory activity, may enhance cell-based therapy for male and female pattern hair loss by promoting cell migration into hair follicles.

This study found that the K6/ODC transgenic mouse model is highly sensitive to identifying genotoxic carcinogens, showing 100% concordance with traditional rodent bioassays.

The researchers reported that in nonmelanoma skin cancers, the expression of osteopontin splice variants is significantly higher compared to normal skin, with OPN-a elevated in basal cell carcinoma more than OPN-c.