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The conclusion is that substances can penetrate hair fibers through multiple pathways, including both the cell membrane complex and the non-keratinous parts.

The ethosomal delivery system improves topical drug delivery and promotes hair growth.

Hair follicle stem cells help maintain skin health by moving to and supporting the skin's surface layers.

Healthy skin prevents water loss and protects against threats.

Sensory neuron and Merkel cell changes in the skin happen independently during normal skin maintenance.

Sonophoresis reduces skin absorption of sodium fluorescein in certain liposomes.

A patient with granuloma annulare experienced both isotopic and isomorphic responses, with skin lesions responding to steroids but relapsing after stopping treatment.

TCF/Lef1 activity is essential for proper skin cell development and renewal.

Fgf20 is crucial for hair follicle formation by influencing cell movement and growth.

ERK activation spreads between cells in mouse skin, linked to cell division and influenced by TPA and EGF receptors.

Skin cells control immune cell placement, helping the skin respond better to challenges.

Fgf20 helps form hair follicle structures by stopping cell division and increasing cell movement.

The dermal sheath's contraction is crucial for hair follicle regression and stem cell relocation.

Sensory neuron and Merkel cell changes in the skin happen independently during normal skin maintenance.

The new "differential stripping" method effectively measures how much substance gets into hair follicles.

Increasing calcium sensing receptor speeds up skin and hair development in mice.

Fibroblast behavior is key for skin structure and healing.

A new method was developed to create better skin models for healing and reconstruction.

Ift20 is essential for hair follicle function and skin cell movement.

Sensory neuron changes and Merkel-cell changes in the skin happen independently during normal skin maintenance.

Skin has a larger surface area than thought, certain skin cells improve skin flap survival, better trials for skin conditions in children are needed, Stevens-Johnson syndrome rates vary by age and race, and better skin barrier function may reduce inflammation in the elderly.

Adult esophageal cells can start to become like skin cells, with a key pathway influencing this change.

The author suggests changing "telogen effluvium" to "telogen defluxion" for hair loss terminology.

Diffusion in artificial sebum is mainly influenced by molecular size and is much faster than in skin lipids.

External agents penetrate skin more easily in areas with fewer lipids, especially through hair follicles.