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Too much Smad7 changes skin and hair development by breaking down a protein called β-catenin, leading to more oil glands and fewer hair follicles.

Estrogen replacement can improve skin health in menopausal women but doesn't reverse sun damage or prevent hair loss.

Stem cell plasticity is crucial for wound healing but can also contribute to cancer development.

Hair grows faster in the morning and is more vulnerable to damage from radiation due to the internal clock in hair follicle cells.

Animals that change color with the seasons mainly do so in response to daylight changes, but climate change is causing camouflage problems that may require evolutionary changes.

Dutasteride, fesoterodine, and finasteride are beneficial for older patients, while most other drugs should be used cautiously or avoided.

Psoriasis skin changes are complex and might need several biopsies for a clear diagnosis.

Pregnancy can cause skin pigmentation, stretch marks, and changes in hair, nails, and sweat glands, with most resolving after birth.

Minoxidil helped bald patient regrow hair.

Some drugs can cause hair loss, change hair color and shape, or increase hair growth, and treatment may involve stopping the drug or using specific hair growth treatments.

Hormonal treatments can help with acne but are not the first choice due to side effects and the need for careful patient selection.

Some heart drugs show promise for other conditions, but more research is needed to confirm their effectiveness and safety.

Pregnancy causes skin changes like darkening, hair thickening, nail changes, and increased risk of skin growths, most of which usually resolve after birth.

Kennedy's disease leads to muscle weakness and sensory issues, has no cure but manageable symptoms, and future treatments look promising.

The TRPV3 gene mutation affects hair growth by keeping mice in the growth phase longer, which could help treat hair loss.

Different types of androgens bind differently to two receptors, AR1 and AR2, in Atlantic croaker's brain and ovarian tissues, suggesting these receptors may control different androgen actions in fish.

Older skin has higher cancer risk due to inflammation and stem cell issues.

Medium lipophilic substances penetrate skin best, and adding ethanol can increase delivery to hair follicles.

Chitosan-decorated polymersomes improve finasteride delivery for hair loss treatment.

Antiandrogen treatments combined with oral contraceptives can help manage hair growth and hair loss in women with PCOS.

Small molecule drugs show promise for advancing regenerative medicine but still face development challenges.

Testosterone replacement may improve sexual desire and bone health in women with low androgen levels, but more research is needed on its long-term safety.

A mother's western diet can make her milk toxic, causing inflammation and hair loss in babies.

Menopause significantly reduces skin collagen, leading to thinner, less elastic skin, and hormone replacement may help but requires careful consideration.

Lipophilic dyes accumulate more in hair follicles when delivered with surfactant-propylene glycol solutions.

Targeted cancer therapies often cause skin problems that need careful management to improve patient quality of life and treatment success.

Engineered skin substitutes can grow hair but have limitations like missing sebaceous glands and hair not breaking through the skin naturally.

Massage increases how deep both rigid and flexible liposomes can go into skin, with flexible ones going deeper, and covering the skin (occlusion) helps rigid ones more.

Finasteride and CPA-EE2 equally reduce hirsutism, but affect hormone levels differently.

Different species and human skin models vary in their skin enzyme activities, with pig skin and some models closely matching human skin, useful for safety assessments and understanding the skin's protective roles.