Educational information, not medical advice — ask your doctor or midwife.
Ringworm plant is a shrub with tall yellow flower spikes that look like candles. Its botanical name is Senna alata. In Yoruba it is called asunwon oyinbo.
It is best known in West Africa as a skin remedy. The fresh leaves are crushed and rubbed on itchy, scaly patches. The same leaves are also taken by mouth as a strong laxative.
The honest verdict: the human evidence is thin. A few small, short trials hint that leaf preparations may help some fungal skin rashes. Long and widespread traditional use is real, but it is not proof that a remedy works, and it is not proof that it is safe.
This page covers both uses, because they carry very different risks. Rubbing leaf on skin is a modest risk. Swallowing it is a drug-like laxative action with real hazards.
No one has shown how it works in people. What follows is proposed, not proven.
The leaf is rich in anthraquinones, a group of plant compounds. In laboratory tests, leaf extracts slow the growth of skin fungi. These include the fungi behind ringworm and athlete's foot.
Whether that happens on living human skin is not established. A dish of fungus is not the same as a rash on your arm.
Taken by mouth, anthraquinones act on the lining of the large bowel. In senna plants this effect is well known in people. It speeds the bowel along and brings on a bowel movement.
That is a strong, drug-like action. It is the same type of effect as an over-the-counter stimulant laxative.
Lab and animal work also reports anti-inflammatory and antibacterial activity. Those findings have not been matched by good human trials.
Almost every form is made from the leaves. Fresh leaf is the traditional starting point.
Fresh leaf paste or juice is rubbed straight onto the skin. Creams, ointments, lotions and medicated soaps made from leaf extract are sold in West Africa and in tropical Asia.
Dried leaf is also brewed as a tea and used as a laxative. Capsules, powders and tinctures of dried leaf are sold online.
Quality control is patchy. Market and online products are rarely tested for strength or purity. Labels often give no sennoside content at all.
The plant has a long and well-documented place in West African home medicine. Yoruba herbalists used it for ringworm and other itchy skin complaints, and the Yoruba name asunwon oyinbo reflects that standing.
It spread widely through the tropics. Healers in the Caribbean, India, South East Asia and the Philippines used the leaf for skin rashes and as a purge.
Colonial-era plant records from the 1800s and 1900s list it under names such as candle bush and ringworm bush. Those records describe what people did with it. They do not test whether it helped.
Stop and see a doctor if the rash is spreading, weeping pus, or no better after two weeks. Fever with a rash needs same-day care.
Stop oral use and get medical help if you have severe cramps, blood in your stool, or black stools.
Get urgent care for muscle weakness, a racing or irregular heartbeat, fainting, or very little urine. These can point to low potassium or dehydration.
Seek care straight away for yellow eyes or yellow skin, which can signal a liver problem.
In the United States, the United Kingdom and the European Union, Senna alata is not a licensed medicine. It is sold as a herbal product, cosmetic or soap, and those products are not checked for strength the way medicines are.
In Nigeria, Ghana and other West African countries the leaf is sold openly in markets and in local herbal preparations.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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