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Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

This review proposes a classification system for childhood hair loss based on clinical appearance, age of onset, and associated symptoms, but reports no new clinical results.

This study found that photodynamic therapy using 5-aminolevulinic acid or methyl aminolevulinate is a safe and effective treatment for acne vulgaris, particularly with 30 to 60 minutes of contact time and three treatments for significant long-term improvement.

This study concluded that coat damage in captive rhesus macaques is unlikely caused by parasitic, bacterial, or mycotic infections but may be linked to environmental or behavioral factors affecting hair growth.

This study found that Indian women with PCOS following a vegetarian diet had higher pro-inflammatory and lower anti-inflammatory marker levels compared to age and BMI-matched non-vegetarian counterparts.

This study found that women with polycystic ovary syndrome had significantly higher serum and intrafollicular levels of anti-Müllerian hormone compared to normovulatory women, indicating a potential marker for ovarian hyperstimulation syndrome risk.

This study suggests that early onset androgenetic alopecia in men may indicate a male PCOS equivalent, possibly leading to higher risks of metabolic and cardiovascular disorders later in life.

This review discusses the potential therapeutic use of thyroid hormones on skin conditions, highlighting the need for further research but reporting no new experimental results.

This study found that low iron stores are a risk factor for excessive hair loss in non-menopausal women.

This review outlines various non-rash skin toxicities associated with novel targeted anticancer therapies and provides guidelines for their early diagnosis and management, but reports no new clinical results.

This study identified a large deletion in the desmoglein 4 gene as the genetic basis of the Iffa Credo "hairless" rat's skin phenotype, linking it to lanceolate hair mutations.

This review discusses various nanotechnology-based strategies for managing melasma and reports no new clinical results, highlighting the potential of innovative drug delivery systems in treating hyperpigmentation.

This review discusses complications from hyaluronic acid filler treatments and explores their causes, presentation, and possible treatment guidelines, without presenting new results.

In this study, normal weight adolescents with PCOS showed increased insulin resistance and significantly lower levels of high molecular weight adiponectin compared to controls, despite no other metabolic differences.

This review highlights that hyperandrogenism is a crucial factor for diagnosing PCOS during adolescence, while traditional criteria like polycystic ovarian morphology may be misleading.

This article reviews Cronkhite-Canada syndrome as a distinct condition from Peutz-Jeghers syndrome and familial polyposis, with cases showing gastrointestinal polyposis, skin, hair, nail abnormalities, and hypoproteinemia.

This study suggests that hormonal changes may contribute to the persistent symptoms of long COVID, with specific patterns observed in serum hormone levels related to fatigue and sensory dysfunction.

This review discusses the role of cholesterol homeostasis in hair follicle biology and its potential connections to various hair disorders, but it reports no new findings.

In this study, researchers found that petroleum ether extract of Eclipta alba significantly stimulated follicular keratinocyte proliferation and reduced TGF-β1 expression in nude mice, suggesting potential use for certain types of alopecia.

Women's ovarian hormones and adrenal androgens change throughout life, affecting hair loss and health.

This study found that biallelic LSS mutations lead to congenital hypotrichosis and cataracts, with each tissue-specific loss of function observed in mouse models.

This review examines the benefits and potential risks of androgen replacement therapy for male hypogonadism but reports no new clinical results; the authors highlight the need for careful risk assessment, especially in older men.

This review discusses the role of contraceptives in dermatology, particularly for acne treatment and managing patients on teratogens, but reports no new clinical results.

In this study, researchers found that impaired cholesterol biosynthesis in hair follicles may trigger an inflammatory immune response linked to primary cicatricial alopecia, providing new insights into the disorder's pathogenesis.

This review discusses the pathophysiology of delayed ejaculation, highlighting the role of various biogenic and psychogenic factors, but reports no new clinical findings.

The researchers reported that various environmental factors and higher testosterone levels were linked to different patterns of hair loss in women with androgenic alopecia.

This review discusses how certain genetic, infectious, and metabolic conditions might influence disease severity and highlights the potential for new therapies, but it presents no new research findings.

Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.

In this study, low-dose BPA was associated with induced prostatic hyperplasia in rats, potentially mediated by COX-2 and L-PGDS through pathways involving cell proliferation and apoptosis.

This study identifies a likely pathogenic homozygous missense variant in the AEBP1 gene in a patient with symptoms of classical Ehlers-Danlos syndrome, suggesting new perspectives for EDS classification and research.