Skin Inflammation

What kind of skin inflammation are we talking about?

An itchy patch after using a new product and recurring eczema can look similar, but they raise different questions. Contact dermatitis follows exposure to an irritant or allergen; atopic eczema tends to come and go in flares. Identifying the condition comes before choosing a supplement. 1 2

This page focuses on eczema and on the difference between treating inflammation and improving skin hydration. It does not review every inflammatory skin disease.

What does it look and feel like?

Eczema can leave skin dry, cracked, scaly or thickened as well as itchy. Inflammation does not always look bright red: affected skin may be purple, gray, lighter or darker than the surrounding area, depending on skin tone. 2

In eczema studies, researchers ask about itching and lost sleep as well as examining the skin. A combined score called SCORAD captures symptoms and clinical signs; a small change in that score need not mean a noticeable improvement in daily life. 3

Why does it keep returning?

Contact dermatitis can follow repeated exposure to water, soap or detergent, or an allergy to something such as nickel or an ingredient in cosmetics. Avoiding the identified trigger can allow the skin to clear. 1

For suspected atopic eczema, clinicians examine the pattern and duration of the rash and consider other conditions. Allergy testing is useful when there is a specific suspicion; a positive test alone does not establish that a food is causing the eczema. 4

When does a rash need medical attention?

Persistent, recurrent or severe symptoms deserve an assessment, especially when the cause is unclear or treatment is not helping. 1

Eczema that suddenly worsens, becomes painful, warm or swollen, leaks fluid or develops pus needs prompt medical assessment, particularly with fever or feeling unwell. Infection can require treatment beyond ordinary skin care. 2

Do oils or probiotics improve eczema?

The trials below ask whether people itch less, sleep better or have fewer visible symptoms. They provide direct tests of oils and probiotics for established eczema. 3 5

The probiotic hypothesis arose partly because studies found differences in gut bacteria between people with and without eczema. Changing those bacteria was proposed as a way to influence symptoms. That is a reason to test a treatment, not proof that the tested products relieve eczema. 3

Evening primrose oilNot supported

A Cochrane review of 27 trials involving 1,596 people assessed evening primrose and borage oils. Neither improved overall eczema symptoms more than placebo. That is evidence against using these oils as eczema treatment, rather than simply an absence of research. 5

ProbioticsNot supported

A 2018 Cochrane review included 39 trials and 2,599 participants, mostly children. Probiotics made little or no difference to patient-rated symptoms. The clinical score improvement averaged 3.91 points on a 103-point scale, below the estimated meaningful difference of 8.7 points. Products and strains varied, so this is not a verdict on every possible strain. 3

Why a hydration result is not an inflammation result

A Polish trial followed 50 young adults taking isotretinoin for acne for nine months. Adding evening primrose oil improved a skin-hydration measurement, but did not produce a between-group difference in water loss through the skin or sebum. This addresses skin condition during acne treatment, not whether the oil can replace acne medication or treat eczema. 6

The astaxanthin review describes antioxidant and anti-inflammatory effects in animal studies as a rationale for human research. Whether those mechanisms translate into relief of a diagnosed inflammatory skin condition remains a separate clinical question. 7

AstaxanthinToo little evidence

A 2021 review found improvements in skin moisture and elasticity, but no statistically significant reduction in wrinkle depth. These cosmetic outcomes do not demonstrate relief from an inflammatory rash. The review is relevant to skin appearance, not evidence of eczema treatment. 7

What has a more established place in care?

Regular emollients, which help the skin retain moisture, and avoiding known irritants are central to eczema care. For flares, topical corticosteroids can effectively reduce itching and inflammation; other prescription treatments are available when these measures are insufficient. 4

For contact dermatitis, finding the offending substance can be more useful than adding another product. Moisturizers and, when needed, prescribed steroid creams help manage symptoms while the trigger is addressed. 1

What should be checked before trying a supplement?

The oil trials reported mainly mild digestive problems, but long-term safety was not established. The Cochrane review also flags a potential bleeding interaction between evening primrose oil and warfarin, a reason to discuss the combination with the prescribing clinician. 5

Probiotic trials reported digestive symptoms. The review did not detect an increased rate of adverse events, but rated this evidence as low quality; that leaves uncertainty about harms rather than establishing that every product is risk-free. 3

What is outside this review?

This page does not assess the other botanicals, vitamin B6, hemp products or individual probiotic formulations listed for this outcome.

Questions people ask