Eczema

Atopic dermatitis is the clinical form of eczema. One phase IV randomised, double-blind, placebo-controlled multicentre trial in 105 children and adolescents (2–17) with moderate atopic dermatitis tested oral standardised extract added to topical corticosteroids over 6 months as a steroid-sparing adjunct ^{15Reference 15Ramírez-Bosca et al. · 2012RCTPolypodium leucotomos extract in atopic dermatitis: a randomised, double-blind, placebo-controlled trialView study →}. It is a single trial in one population and has not been independently replicated.

Aloe’s skin evidence is for radiation-induced dermatitis (a self-controlled clinical trial ^{1Reference 1Haddad et al. · 2013Clinical trialAloe vera for prevention of radiation-induced dermatitis: a self-controlled clinical trial.Current Oncology, 20(4), 345. doi:10.3747/co.20.1356View study →}) and thermal burns (thromboxane/prostaglandin inhibition preserving dermal circulation ^{2Reference 2Bone · 2003A clinical guide to blending liquid herbs: Herbal formulations for the individual patient}) — not eczema. Its emollient and vulnerary action plausibly extends to eczema, but no eczema-specific trial has tested it.

Calendula’s topical anti-inflammatory action has a resolved mechanism — free faradiol equals indomethacin in the mouse-ear edema assay and the faradiol monoesters carry the whole-extract effect ^{3,4Reference 3Della Loggia R et al. · 1994In vitroThe role of triterpenoids in the topical anti-inflammatory activity of Calendula officinalis flowers — [in vitro / animal model]View study →Reference 4Zitterl-Eglseer K et al. · 1997In vitroAnti-oedematous activities of the main triterpendiol esters of marigold (Calendula officinalis L.) — [in vitro / mouse model]View study →} — and a controlled human irritant-contact-dermatitis model found marigold cream significantly reduced sodium-lauryl-sulfate skin irritation ^{5Reference 5Fuchs SM et al. · 2005Clinical trialProtective effects of different marigold (Calendula officinalis L.) and rosemary cream preparations against sodium-lauryl-sulfate-induced irritant contact dermatitis — [clinical trial]View study →}.

There is no placebo-controlled trial of calendula for an actual inflammatory skin disease such as eczema or psoriasis.

German chamomile is a classic topical anti-inflammatory for irritated skin, its antiphlogistic action mapped to α-bisabolol and chamazulene ^{6Reference 6Jakovlev V et al. · 1979Pharmacological investigations with compounds of chamomile: antiphlogistic effects of (−)-α-bisabolol and bisabolol oxides — animal studyView study →} with human anti-inflammatory support in oral mucositis ^{7Reference 7Valmy J et al. · 2025Meta-analysisAnti-inflammatory effect of chamomile from randomized clinical trials: a systematic review and meta-analysisView study →}; Western tradition explicitly lists eczema ^{8,9Reference 8Mehmood MH et al. · 2015In vitroAntidiarrhoeal, antisecretory and antispasmodic activities of Matricaria chamomilla are mediated predominantly through K⁺-channels activation — animal / in vitro studyView study →Reference 9Battaglia · 2003The Complete Guide to Aromatherapy (2nd ed.) — reference text}.

No eczema-specific trial has been run, and the best-designed topical skin RCT (radiation dermatitis) was null on its primary outcome ^{10Reference 10Meneses AG et al. · 2025RCTComparison of liposomal gel with and without chamomile to prevent radiation dermatitis in breast cancer patients: a randomized controlled trialView study →}. Its eczema use is topical and rests on the anti-inflammatory mechanism and a long dermatological tradition.

In a small clinical study, topical manuka honey reduced atopic-dermatitis lesion severity, attributed partly to immunoregulatory and anti-staphylococcal activity ^{11Reference 11Alangari et al. · 2017Clinical trialHoney is potentially effective in the treatment of atopic dermatitis: clinical and mechanistic studies [clinical trial]View study →}. The study tested the honey, a distinct product from the leaf and oil, not the plant itself.

Black seed is an antiallergic and anti-inflammatory herb with human RCT-level evidence in the sibling atopic conditions — allergic rhinitis (8-RCT meta-analysis) ^{12Reference 12He Y et al. · 2024Meta-analysisMeta-analysis of randomized controlled trials assessing the efficacy of Nigella spp in allergic rhinitisView study →} and asthma ^{13Reference 13He T · 2020Meta-analysisThe influence of Nigella sativa for asthma control — a meta-analysisView study →} — plus meta-analytic reductions in CRP/TNF-α/MDA ^{14Reference 14Montazeri RS et al. · 2021Meta-analysisThe effect of Nigella sativa on biomarkers of inflammation and oxidative stress — systematic review and meta-analysis of randomized controlled trialsView study →}, and it is traditionally applied topically to eczema.

No eczema-specific trial has been run; its eczema use extends from related atopic disease. Topical black-seed oil can itself cause allergic contact dermatitis.

Amazonian and Indian ethnomedicine lists abuta among topical remedies for sores, boils and childhood eczema. No research addresses this use.

Ayurveda used albizzia bark and flowers for eczema and pruritus, and its antihistamine/mast-cell action lends plausibility, but the research is on allergic asthma and rhinitis, never eczema.

Burdock is the archetypal Western alterative, or ‘blood cleanser’, for chronic eczema, used long-term in constitutional skin formulas. The mechanism behind this role is thin, and there is no clinical skin trial.

Brazilian/Amazonian tradition uses cashew leaf and bark (as a tea or wash) for eczema and psoriasis. No research has tested this use. The remedy is the leaf and bark, not the caustic nut-shell oil, which itself causes contact dermatitis.

Chickweed is a textbook cooling demulcent and emollient, applied as succus, salve or cream for eczema and itching. The research base is entirely preclinical. The fresh plant is itself a documented contact allergen.

Gotu kola is a traditional Ayurvedic and Western remedy for skin conditions including eczema. Its human skin evidence is for wound and scar healing and venous disease, not eczema.

Blue flag is a classic 19th-century Eclectic hepatic/lymphatic ‘alterative’ for skin conditions arising from liver congestion, including eczema. The use is long established, but the evidence base is very thin, and blue flag is an acrid, emetic herb taken in low doses.

Milk thistle is traditionally used for eczema as a secondary effect of poor liver health (the ‘blood cleanser’ rationale). Its research is entirely liver and metabolic, with no skin data.

Neem is one of Ayurveda’s cardinal blood-purifiers for skin disease and itching, applied as a leaf paste. The research supports oral/dental and preclinical anti-inflammatory action but nothing eczema-specific. The eczema remedy is the topical leaf paste; neem seed oil is toxic taken internally.

Red clover is a classic Western alterative, or ‘blood cleanser’, combined with burdock and yellow dock in long-term eczema formulas. Its human evidence is entirely for menopause and lipids (isoflavones).

Ayurveda applies turmeric topically for eczema. Its anti-inflammatory action is proven in humans, but the data are systemic, joint and metabolic, with no eczema or skin-disease trial.

Yellow dock is a quintessential Eclectic alterative, or ‘blood purifier’, for chronic eczema, especially where constipation and skin disease coexist. The research is thin and preclinical, with no eczema data.