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Certain skin drugs and topical agents, including some natural extracts and fragrances, can cause allergic reactions. Some hair dyes and extensions, as well as minoxidil, a hair growth treatment, can also cause allergies. Botulinum toxin A can effectively reduce sweat but may have temporary side effects.

This study identified the most common allergens in hair products linked to scalp allergic contact dermatitis, with hair dyes, shampoos, and conditioners primarily associated with the condition.

This study identifies important differences in allergens found in hair products marketed for ethnic hair compared to nonethnic hair, with fragrances being the most common allergen in ethnic products.

This study found that "clean" shampoos are less likely to contain allergenic preservatives compared to traditional shampoos, but both types use fragrance equally, which can be irritating or allergenic.

In this study, male patients treated with 150 mCi of radioactive iodine showed no negative impact on fertility, but long-term studies with larger groups are needed to further assess hormonal effects and sperm health after this treatment.

This review highlights the importance of implementing dementia screening and cognitive evaluation in primary care to better prepare healthcare providers for managing cognitive impairment in the aging population.

This study found that hair thickness and density increased after treatment with human follicle mesenchymal stem cells and platelet rich plasma, associated with enhanced Wnt signaling and platelet derived growth factors.

Minoxidil promotes hair growth by increasing cell division and DNA synthesis.

This study found that topical minoxidil solutions showed the highest skin permeation at 3-4% concentrations, with crystallization occurring at a 5% concentration due to vehicle component evaporation.

This study found that increasing the proportion of ethanol in minoxidil formulations improved skin penetration in both in vitro and in vivo tests on mice.

This study found that minoxidil penetration through the skin increased with higher ethanol content and occlusion, with the highest penetration observed at 90% ethanol.

Saw palmetto extract can block the enzyme that converts testosterone in pig prostate cells.

In this study, researchers found that overexpression of IGF-1 in transgenic mice stimulated increased vibrissa growth during the first neonatal hair cycle compared to their nontransgenic littermates.

Finasteride helps treat hair loss by blocking enzyme activity.

This study found that finasteride impaired object recognition memory and altered hippocampal dendritic structures in male 3xTg-AD mice, suggesting potential sex differences in Alzheimer's disease pathology.

This study found that sebaceous-gland-derived glycerol significantly contributes to stratum corneum hydration in mice with sebaceous gland deficiencies.

This review of Cynoglossum amabile, a traditional Chinese and ethnomedicine, provides insights into its uses, chemical components, biological activities, and toxicity. Highlighting its market potential, the study underscores the importance of indigenous knowledge in drug development despite noted hepatotoxic risk linked to its pyrrolizidine alkaloids.

In their review, the authors discussed the increasing issue of allergies to hair products, highlighting common allergens such as hair dyes and topical minoxidil, and outlined diagnostic methods and alternatives for those affected, particularly addressing higher risks among hairdressers due to professional exposure.

This review highlights the challenges in treating alopecia areata, noting that current therapies often lead to relapse and have uncertain long-term effectiveness; it also points to potential future treatments such as JAK-STAT inhibitors and PRP.

This study identified two novel genetic variants associated with Alzheimer's disease in APOE ε4 non-carriers, revealing insights into the disease's underlying regulatory mechanisms.

This study found that long-term use of triterpenoids from Ganoderma lucidum may improve brain function and alleviate aging-related issues in normal and Alzheimer's mouse models.

This study observed that amino acid uptake into wool follicles varies significantly, with cysteine showing the highest uptake rate, suggesting specialized transport systems that may influence wool growth.

This study found that novel compounds moderately inhibited 5α-reductase type 1 activity compared to finasteride, offering valuable data on structure-activity relationships.

This study identifies KLK14 as a significant factor contributing to hair defects and skin inflammation in a mouse model of Netherton syndrome.

In this double-blind, randomized controlled study, researchers found that Wen by Chaz Dean Sweet Almond Mint Cleansing Conditioner was similarly tolerated compared to three other hair cleansing conditioners and was significantly better tolerated than salicylic acid shampoo or baby shampoo in terms of skin reactions.

Avoiding certain allergens in personal care products may improve symptoms for some patients with lichen planopilaris or frontal fibrosing alopecia.

In this retrospective study, researchers from the University of Bologna observed that trichoscopy can aid in diagnosing allergic scalp contact dermatitis, with key findings including common trichoscopic patterns of erythema, white scales, arborizing vessels, and simple red loops in 12 patients diagnosed with the condition.

This study reported that gain-of-function mutations in TRPV3 lead to hair loss in mice by disrupting inner root sheath keratinocyte differentiation, ultimately causing follicular keratinocyte stem cell exhaustion and permanent follicle disruption.

This study found that combining mesenchymal stromal cells from adipose tissue and hair follicles with soy protein and β-chitin scaffolds significantly reduced wound healing time and improved skin regeneration in vivo.

This study examined the sensitization potential of common hair care products and found that certain ingredients, like cobalt chloride and nickel sulfate, frequently cause allergic reactions in individuals with hair diseases, providing essential insights for personalized treatment strategies.