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Glossary Sun Exposure

exposure to the sun's ultraviolet rays affecting skin health

Sun exposure, also known as sunlight exposure or UV exposure, refers to the amount of time the skin is exposed to the sun's ultraviolet (UV) rays. While moderate sun exposure is essential for the production of vitamin D, excessive exposure can lead to skin damage, premature aging, and an increased risk of skin cancer.

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Research

5 / 1000+ results

research Skin epidermal keratinocyte p53 induces food uptake upon UV exposure

1 citations , December 2023 in “Frontiers in Behavioral Neuroscience”

The study found that in mice, conditional knockout of p53 in epidermal keratinocytes reduced food intake following UVB exposure and resulted in anxiety-related behaviors, suggesting that p53 plays a role in appetite stimulation and anxiety via UVB-induced β-endorphin production.

research 1395 Impact of urban pollution on top of chronic sun-exposure on skin ageing in Chinese women

April 2023 in “Journal of Investigative Dermatology”

This study reported that urban pollution accelerates facial wrinkle development and increases pigmentation severity in Chinese women over 30, whereas UV exposure affects these signs from age 20. After 45, pollution becomes a key contributor to skin aging.

research Association of Short-Term Exposure to Ambient Fine Particulate Matter with Skin Symptoms in Schoolchildren: A Panel Study in a Rural Area of Western Japan

7 citations , March 2017 in “International Journal of Environmental Research and Public Health”

This study found that short-term exposure to PM2.5 and Asian dust particles did not increase skin symptoms in schoolchildren.

research Skin and scalp under exposure to high-energy visible light: the current perspective

2 citations , March 2025 in “Archives of Dermatological Research”

HEV light can harm or help skin and scalp, so safe exposure guidelines are needed.

research Blue-gray discoloration of the skin after levofloxacin exposure in a 44-year-old man with pulmonary tuberculosis

May 2023 in “Authorea (Authorea)”

In this report, researchers documented a rare complication linked to levofloxacin, used as a second-line treatment for tuberculosis, which could include various adverse events during TB therapy.

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Community Join

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community Making my own topical finasteride - ethanol question

4 upvotes 4 years ago

The conversation is about making topical finasteride using ethanol. The user is advised to use non-denatured or food-grade ethanol, as denatured ethanol may be harmful with prolonged skin exposure.

community One Year Progress (Topical Fin/Min)

in Progress Pictures 154 upvotes 1 year ago

The user experienced significant hair regrowth over a year using topical finasteride (0.1%) and minoxidil (7%), along with Ketoconazole shampoo, and recently switched to dutasteride and plans to add oral minoxidil. They managed side effects like oily skin and itchiness with a corticosteroid and chose topical treatments initially to limit systemic exposure.

community microneedling and sun exposure

in Microneedling 10 upvotes 9 months ago

Avoid sun exposure for 7-14 days after microneedling the scalp, using a hat for protection. Sunscreen on the scalp can be messy and irritating.

community So does oral minoxidil age your skin or not

43 upvotes 2 years ago

Oral minoxidil may cause dry skin and dark eye bags but doesn't significantly age the skin. Topical minoxidil is toxic to cats, and some users prefer finasteride.

community Sunlight: Does it Stimulate Hair Growth or Hair Loss?

in Research/Science 64 upvotes 2 years ago

The conversation discusses whether sunlight exposure affects hair growth or loss, with mixed anecdotes and theories but no clear consensus. Some suggest moderate sunlight can benefit hair by providing vitamin D, while others doubt its effectiveness compared to treatments like Minoxidil or finasteride.

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Learn

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learn Hydrocortisone

Mild corticosteroid used on the skin and scalp

learn Finasteride

Does the vehicle change how much topical finasteride is absorbed? Formulation sources describe propylene glycol and microemulsion vehicles as increasing how much topical finasteride crosses the skin, but better penetration has not been shown to mean better hair results, and it also raises systemic exposure. The vehicle and strength are decisions for a prescriber or compounding pharmacist.

learn Verteporfin

Light-activated eye drug being studied for scarring

learn Estradiol

Estrogen hormone, prescribed in tablet, patch and gel forms

learn Thymosin Beta 4

learn Minoxidil

Vasodilator used on the scalp and, at low doses, as a tablet

learn Melatonin

Can melatonin cause side effects on the skin or hair? No study links melatonin to hair loss; reports are anecdotal. Some users report scalp dryness or irritation from topical products, and a safety review lists mainly mild side effects such as sleepiness and headache.

learn Follistatin

Can follistatin be applied to the skin, and does any form of it treat hair loss? No study shows that follistatin applied to the skin works, and no form of follistatin is an approved or proven hair-loss treatment. Follistatin injections, "research peptides" and gene therapies sold outside regulated trials are unapproved and of unknown safety.

learn Hyaluronic Acid

Does hyaluronic acid really hydrate the scalp, or is it mainly for skin care? Hyaluronic acid improved hydration of facial skin in trials. It has not been tested on the scalp.

learn Osteopontin

What does osteopontin do in skin healing and inflammation? Osteopontin takes part in wound repair in mouse skin; its role in human scalp healing and inflammation has not been studied.

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Clinics

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All 500 clinic results →

Experts

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SMP Specialist
Noelle Skin
Nice, France

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Noelle Skin