Aana Avanna Journal Home Remedies

Thengai Ennai for Dry Skin and Eczema: What Coconut Oil Can and Cannot Do

Virgin coconut oil in a clear glass jar beside a halved coconut, illustrated in watercolour

Thengai ennai — தேங்காய் எண்ணெய் — has been used across Tamil and Sri Lankan homes for generations on skin, hair and the body.

For dry skin, this is one traditional remedy where modern research gives us something useful to say: plain virgin coconut oil can work as a moisturising oil, and small clinical trials suggest it may also help some people with mild to moderate atopic eczema.

That does not make coconut oil an eczema cure, an infection treatment, or a replacement for prescribed emollients and topical medicines.

Quick answer

Evidence rating: Evidence-supported as a moisturiser for dry skin; promising clinical evidence as an adjunct for mild to moderate atopic eczema.

  • For ordinary dry skin: Coconut oil can reduce dryness and improve skin hydration.
  • For eczema: Some trials found improvement, but standard eczema care still centres on regular unperfumed emollients and appropriate anti-inflammatory treatment.
  • Best studied form: Virgin or extra-virgin coconut oil rather than fragranced cosmetic oils.
  • Do not use it as: a treatment for infected, weeping or rapidly worsening eczema.
  • Babies: Be more cautious, especially in infants with eczema; clinician-recommended emollients are the safer default.

Why coconut oil became a household skin remedy

In Tamil and Sri Lankan households, coconut oil has never belonged to only one category.

It may sit in the kitchen, in the bathroom, beside the comb, or in the hands of an elder oiling a child's scalp or dry limbs after a bath.

That flexibility makes sense culturally. Coconut is a familiar everyday material, and oiling the skin has long been part of personal care in South Asia.

But cultural familiarity does not automatically prove a medical claim.

So the useful question is not:

“Did our families use it?”

They did.

The better question is:

“What does the evidence actually support?”

Does coconut oil actually moisturise dry skin?

Yes — there is clinical evidence that it can.

A small randomised double-blind trial in 34 people with mild to moderate xerosis — ordinary dry, rough, scaly skin — compared extra-virgin coconut oil with mineral oil applied twice daily for two weeks.

Both improved skin hydration and surface lipid levels, with no meaningful safety difference between the two groups. The researchers concluded that coconut oil performed comparably to mineral oil as a moisturiser.

This is not a huge study, and it does not mean coconut oil is superior to every modern emollient.

But it supports something quite practical:

Plain coconut oil can function as a genuine moisturising oil rather than merely a cultural comfort practice.

How might it help the skin barrier?

Healthy skin needs to hold water while keeping irritants out.

When the outer skin barrier is dry or disrupted, water escapes more easily through the surface. This is known as transepidermal water loss.

Coconut oil is rich in fatty acids and creates an oily layer over the skin. In practical terms, that can:

  • reduce the feeling of dryness and tightness;
  • soften rough or flaky skin;
  • help reduce water loss from the surface;
  • support the lipid-rich outer skin barrier.

One of its major fatty acids is lauric acid.

Laboratory work and some small clinical studies have also explored antimicrobial effects related to coconut-derived fatty acids. That is interesting science, but it should not be exaggerated.

Coconut oil is not an antibiotic, antiseptic treatment or substitute for medical treatment of infected eczema.

What about eczema?

This is where the evidence becomes particularly interesting — but also where we need to be careful.

A randomised double-blind clinical trial involving 117 children with mild to moderate atopic dermatitis compared topical virgin coconut oil with mineral oil over eight weeks.

The coconut-oil group showed greater improvement in eczema severity scores, lower transepidermal water loss and better skin hydration than the mineral-oil group.

That is encouraging.

However, the comparison was with mineral oil, not with the full modern eczema treatment plan used in UK clinical practice.

NICE guidance continues to describe regular unperfumed emollients as the basis of eczema management, with topical corticosteroids or other prescribed treatments added when needed.

So the honest conclusion is:

Virgin coconut oil may be a useful moisturising option or adjunct for some people with mild eczema, but it should not replace a proper eczema treatment plan.

Coconut oil is not the same as a prescribed emollient

They overlap, but they are not interchangeable in every situation.

Medical emollients are designed and selected specifically for skin conditions. They may be ointments, creams, lotions or other preparations chosen according to how dry the skin is, where the eczema occurs and what the person tolerates.

NICE recommends daily, generous use of unperfumed emollients for children with atopic eczema even when the skin looks clear.

If you already have an eczema plan from a GP, pharmacist, nurse or dermatologist, coconut oil should not quietly replace it because it feels more “natural”.

Natural and medically appropriate are not synonyms.

What kind of coconut oil should you use?

The studies most relevant here used virgin or extra-virgin coconut oil.

If someone wants to try it on intact adult skin, the simplest option is:

  • plain;
  • unperfumed;
  • without essential oils;
  • without added colour or fragrance;
  • without herbal blends whose ingredients are unclear.

A scented “coconut body oil” containing perfume, mineral oils, botanical extracts and essential oils is not the same thing as plain virgin coconut oil.

How to use it for ordinary dry skin

For an adult or older child with simple dry, intact skin:

  1. Wash or bathe with lukewarm rather than very hot water.
  2. Pat the skin gently so it remains slightly damp.
  3. Warm a small amount of coconut oil between clean hands.
  4. Smooth a thin layer over the dry area rather than rubbing aggressively.
  5. Reapply if needed and if the skin tolerates it.

Using a little oil on slightly damp skin can help trap some of that surface moisture.

You do not need to coat the body until it is dripping.

More oil is not automatically more effective.

If you have eczema

If you want to try coconut oil alongside an established eczema routine:

  • use it only on intact, non-infected skin;
  • try a small area first;
  • stop if it stings, reddens, itches or worsens the rash;
  • keep using your recommended emollient and prescribed flare treatment unless a healthcare professional advises otherwise;
  • if using several topical products at the same time, apply them separately and leave several minutes between products.

NICE specifically advises that complementary approaches should not lead children or families to stop regular emollient treatment.

When coconut oil is probably not the right choice

Weeping, crusted or infected eczema

Do not rely on coconut oil if the skin is rapidly worsening, painful, hot, swollen, oozing, crusted or producing pus.

Those symptoms may suggest infection and need appropriate medical assessment.

Open wounds

Coconut oil is not sterile wound care.

Do not use kitchen or cosmetic coconut oil as a treatment for significant cuts, ulcers or open wounds.

Acne-prone facial skin

Coconut oil is quite heavy and occlusive. Some people with acne-prone skin find that it worsens congestion or breakouts.

If your face reacts badly to it, stop using it. A lighter, fragrance-free moisturiser may suit you better.

Known coconut allergy

True coconut allergy is uncommon, but it does occur.

If coconut has previously caused an allergic reaction, do not experiment with topical coconut oil without medical advice.

What about babies?

This needs more caution than traditional advice sometimes suggests.

Babies with eczema have a damaged skin barrier, and there is concern that repeatedly putting food proteins or food-derived products onto inflamed infant skin may contribute to sensitisation in some children.

Allergy UK advises avoiding food-based oils, including coconut oil, on the skin of atopic infants, particularly babies under six months with eczema.

For babies with eczema, a clinician-recommended, fragrance-free emollient is the more cautious default.

Traditional baby oiling is an important cultural practice, but when eczema is present, the child's skin condition should guide what is used.

Does coconut oil kill bacteria on eczema?

There is some human and laboratory research suggesting virgin coconut oil and coconut-derived fatty acids can reduce Staphylococcus aureus colonisation.

One small adult eczema trial found a reduction in S. aureus colonisation after virgin coconut oil use.

That does not mean you should treat suspected infected eczema at home with coconut oil.

Colonisation, laboratory antibacterial activity and a clinically important skin infection are not the same thing.

If eczema looks infected or you feel unwell, medical assessment matters more than the contents of the kitchen cupboard.

Does coconut oil “heal” eczema?

No evidence supports calling it a cure.

Atopic eczema is a chronic inflammatory skin condition influenced by skin-barrier function, immunity, genetics and environmental triggers.

A moisturising oil may improve dryness and help the skin barrier.

That is useful.

It is not the same as removing the underlying tendency to eczema.

When to seek medical help

Seek advice from a pharmacist, GP or eczema professional if:

  • the rash is persistent or keeps returning;
  • itching is affecting sleep or daily life;
  • you are unsure whether the condition is eczema;
  • the skin is painful, hot, swollen, weeping or crusted;
  • there is pus or rapidly spreading redness;
  • a child has recurrent or severe eczema;
  • usual treatment is no longer controlling the condition.

Seek urgent same-day medical help if eczema suddenly becomes very painful with rapidly worsening areas, clusters of blisters or punched-out sores, fever or marked illness, because eczema herpeticum can require urgent treatment.

If you remember only three things

  1. Coconut oil genuinely can moisturise dry skin.
  2. There is encouraging evidence in mild to moderate eczema, but it is not a cure or replacement for standard treatment.
  3. Do not use household coconut oil to manage infected, open or rapidly worsening skin.

Tradition and science: the final verdict

Thengai ennai is a good example of how Aana Avanna wants to approach traditional care.

We do not need to dismiss a practice simply because it came from our grandmothers.

And we do not need to invent miracle claims to make it meaningful.

In this case, the tradition and the evidence overlap reasonably well:

Plain virgin coconut oil can be a useful moisturiser for dry skin and may help some people with mild eczema, while modern eczema care remains essential when disease is persistent, inflamed or infected.

Preserve your family's version

How was coconut oil used in your home?

  • Was it warmed before being applied?
  • Was it used after bathing?
  • Was it mainly for the scalp, body or both?
  • Did an amma, appa, paati, ammamma or achchi apply it?
  • Was the oil homemade, brought from Sri Lanka or India, or bought after migration?
  • Did the routine change after your family moved to a colder country?

Aana Avanna is interested in documenting those real family practices separately from the medical evidence, so the memory survives without being turned into fake science.

Medical note

This article is for cultural and educational information and is not a personal medical diagnosis or treatment plan. If you or your child has eczema, allergy, broken skin, infection or another ongoing skin condition, follow advice from your own healthcare professional.

Sources and further reading