Skin & Hair
This hub has two branches: skin, and hair and scalp. For each we explain everyday care, common experiences such as dryness, itching, breakouts and shedding, and the conditions behind them, such as acne, eczema, rosacea, psoriasis, pattern hair loss and alopecia areata.
Many skin and hair problems have a medical cause or need targeted care. We cover gentle routines, sun protection, natural ingredients and supplements (including collagen and biotin) with attention to irritation, allergy and lab-test interference, and we say when to see a doctor.
Start here: Skin Care Basics: Gentle Cleansing, Moisturizing and Sun Protection
What would you like help understanding?
Safety and when to get help
- A changing mole, a sore that does not heal, or signs of infection need prompt evaluation.
- Sudden, patchy or scarring hair loss should be evaluated.
- Essential oils and some natural ingredients can irritate or cause allergic reactions; a patch test does not guarantee safety.
Overview
What this goal is about
Skin and hair are the parts of the body we see every day, so changes are noticeable and sometimes upsetting. This goal has two branches. The skin branch covers dryness, itching, redness, breakouts and aging, and conditions such as acne, eczema, rosacea, psoriasis and contact dermatitis. The hair and scalp branch covers shedding, thinning, breakage, flaking and conditions such as pattern hair loss, alopecia areata and seborrheic dermatitis. The pages explain what research shows, label the strength of the evidence, and point to safer next steps. They are educational and are not a substitute for an exam.Common experiences
Dry or tight skin, itch, redness, stinging, and breakouts are common. The NHS says itchy skin is not usually a sign of anything serious. [1] Hair also sheds every day: the NHS says losing 50 to 100 hairs a day is normal. [2] Flaking scalp is usually dandruff, which is not harmful and not caused by poor hygiene. [3] See Dry skin and the skin barrier, Hair shedding and thinning and Dandruff, dry scalp and seborrheic dermatitis.What usually helps
Established advice is simple. Wash gently without scrubbing, moisturize after bathing, and protect skin from the sun. [4][5][6] For conditions, effective treatments are usually medical: for example, the American Academy of Dermatology acne guideline strongly recommends benzoyl peroxide, topical retinoids and other prescribed options, [7] and the NHS lists steroid creams and moisturizers for eczema. [8] Start with Skin care basics, then Acne or Eczema if they apply.What is not proven
Many popular claims have weak evidence. A meta-analysis of complementary treatments for acne, eczema and psoriasis found the evidence insufficient to recommend them. [9] Collagen supplements looked helpful in one meta-analysis but not in higher-quality or non-industry-funded trials in another. [10][11] Evidence that biotin helps hair in healthy people is limited, and biotin can distort some lab results. [12][13] See Collagen, biotin and beauty supplements and Natural skin-care ingredients. "Natural" does not mean free of risk: nearly 80 essential oils have caused contact allergy. [14]When to get help
See a clinician for a mole that changes, skin that is hot, swollen and painful (possible infection), patchy or sudden hair loss, an eye that hurts with facial redness, or a condition that does not improve. [15][16][17][18] For emergencies, such as skin infection with confusion, fast breathing or a very high temperature, call 911 in the United States or your local emergency number. [16] Read Skin and hair safety: when to see a doctor. For research context see Skin and hair research and evidence.Explore Skin & Hair
Goals & Starting Points(1)Where to begin and what you can realistically aim for.
- Skin Care Basics: Gentle Cleansing, Moisturizing and Sun Protection
A plain-language starting guide to gentle cleansing, moisturizing and sun protection, with what NHS, FDA and trial evidence say and when skin changes need a clinician.
Symptoms & Experiences(4)What you may be noticing, and what it can mean.
- Dry Skin and the Skin Barrier
What dry skin and the skin barrier mean, why skin dries or stings, what moisturizer trials show about ceramides and glycerin, and when dry skin needs a clinician.
- Itchy, Red and Sensitive Skin
Common reasons skin itches, turns red or stings, a consensus definition of sensitive skin, gentle self-care from the NHS, and which signs mean you should see a clinician.
- Skin Aging, Wrinkles and Uneven Skin Tone
What research shows about wrinkles, age spots and uneven skin tone: sun protection, tretinoin, retinol and vitamin C trials, supplements, and when to have a spot checked.
- Hair Shedding and Thinning: Why It Happens
Why hair sheds or thins: normal daily loss, telogen effluvium after stress or illness, pattern thinning, medicines and nutrition, and when sudden or patchy loss needs a …
Conditions & Related Topics(8)Named conditions explained in plain language, with established care and what complementary approaches have shown.
- Acne: Breakouts, Evaluation and Care
What acne is, how it is evaluated and treated according to the NHS and the American Academy of Dermatology guideline, and what diet, zinc, tea tree oil and other natural…
- Eczema (Atopic Dermatitis)
Eczema (atopic dermatitis) explained: symptoms, causes, moisturizers and prescribed care, what colloidal oatmeal and coconut oil studies show, and when infection needs u…
- Rosacea
Rosacea explained: flushing, bumps and eye symptoms, common triggers, established care, and why eye pain or vision changes need prompt attention.
- Psoriasis
Psoriasis explained: scaly patches, types, triggers, established treatments and linked conditions, plus what a systematic review found for curcumin, fish oil and other c…
- Contact Dermatitis and Skin Allergy
Contact dermatitis and skin allergy explained: irritant versus allergic reactions, common triggers including fragrances and hair dye, what patch testing is, and avoidanc…
- Pattern Hair Loss (Androgenetic Alopecia)
Pattern hair loss (androgenetic alopecia) explained: how it looks in men and women, what causes it, and what a meta-analysis found for minoxidil, finasteride and laser d…
- Alopecia Areata and Scarring Hair Loss: Patchy Loss Needs Evaluation
Patchy hair loss needs evaluation. What alopecia areata is, how scarring (cicatricial) alopecias differ, what the NIAMS and reviews say, and why early assessment matters.
- Dandruff, Dry Scalp and Seborrheic Dermatitis
Dandruff, dry scalp and seborrheic dermatitis explained: causes including Malassezia yeast, medicated shampoo ingredients from the NHS, other conditions that mimic flaki…
Habits, Routines & Environment(1)Everyday routines, environment and practical changes.
- Hair Care Practices and Breakage
What the sources say about hair care and breakage: tight styling and traction alopecia, chemical products and dyes, product reactions, and when a styling habit may be be…
Food & Nutrition(1)Eating patterns, nutrients and foods.
- Nutrition for Skin and Hair: Iron, Zinc, Protein and Testing First
What research says about iron, zinc, protein, biotin and diet for skin and hair, why testing comes before supplements, and what acne and diet studies found.
Natural Remedies & Supplements(2)Supplements, herbs and natural products, with evidence and safety.
- Natural Skin-Care Ingredients: Aloe, Oatmeal, Fixed Oils and Essential Oils
Aloe, colloidal oatmeal, coconut and other fixed oils and essential oils for skin: what trials and NCCIH say, allergy risks, and links to the full ingredient guides.
- Collagen, Biotin and Beauty Supplements: What the Evidence Shows
Do collagen, biotin, zinc and other beauty supplements work? A look at meta-analyses on collagen and skin, the biotin hair evidence, and how biotin can distort some lab …
Safety & When to Seek Help(1)Warning signs, safety and when to get help.
- Skin and Hair Safety: Irritation, Patch Tests, Infection, Changing Moles and Sudden Hair Loss
Safety for skin and hair: signs of infection, changing moles, patchy or sudden hair loss, product irritation and allergy, patch-test limits, and biotin's effect on lab t…
Research & Evidence(1)How much research exists and how to judge it.
- Skin and Hair Research and Evidence
A PubMed snapshot of how much research exists on common skin and hair topics, why counts are not proof, and how to judge a study on acne, eczema, hair loss or supplement…
Research connections
Our pages cite the studies and official sources behind each statement. For the underlying records, see the evidence page for this goal and the Research Library.
Skin and Hair Research and Evidence Research Library Natural Remedies
Frequently asked questions
Is hair loss normal?
Some daily shedding is normal; the NHS says 50 to 100 hairs a day. Sudden, patchy or heavy loss should be checked. [2]
Can I treat eczema or acne with natural remedies?
Evidence is limited, and a meta-analysis found insufficient support for complementary treatments in acne, eczema and psoriasis. [9]
Do collagen or biotin supplements work?
Results are mixed for collagen and limited for biotin in healthy people. [11][12]
When should I see a doctor about a skin spot?
When a mole changes size, shape or color, or is painful, itchy, bleeding or crusty. [15]
What is the difference between dandruff and a scalp condition?
Dandruff is common and harmless, but flaking can also come from conditions such as seborrheic dermatitis, eczema, contact dermatitis or psoriasis. [3]
References
- NHS, Itchy skin Read 2026-10-22.
- NHS, Hair loss Read 2026-10-22.
- NHS, Dandruff Read 2026-10-22.
- NHS, Acne Read 2026-10-22.
- NHS, Emollients Read 2026-10-22.
- FDA, Sunscreen: how to help protect your skin from the sun Read 2026-10-22.
- Guidelines of care for the management of acne vulgaris. J Am Acad Dermatol 2024. Read 2026-10-22.
- NHS, Atopic eczema Read 2026-10-22.
- Complementary and alternative medicine treatments for common skin diseases: a systematic review and meta-analysis. JAAD Int 2021. Read 2026-10-22.
- Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis. Int J Dermatol 2021. Read 2026-10-22.
- Effects of collagen supplements on skin aging: a systematic review and meta-analysis of randomized controlled trials. Am J Med 2025. Read 2026-10-22.
- A review of the use of biotin for hair loss. Skin Appendage Disord 2017. Read 2026-10-22.
- Immunoassay design and biotin interference. Adv Clin Chem 2022. Read 2026-10-22.
- Essential oils, part IV: contact allergy. Dermatitis 2016. Read 2026-10-22.
- NHS, Moles Read 2026-10-22.
- NHS, Cellulitis Read 2026-10-22.
- NIAMS, Alopecia areata Read 2026-10-22.
- NHS, Rosacea Read 2026-10-22.
Content last updated . This section has not been medically reviewed.