How to soothe a nettle sting rash

What does a stinging nettle look like?

The urtica dioica is the most common stinging nettle - you might even have them in your garden. They're also found in fields, woodlands, and hedgerows, as well as in damp environments.

Chances are you will have seen a stinging nettle before and will recognise one again. They are slender, square, and usually grow between 6-8 feet tall. They have thin, dark green leaves, and sometimes branches. The leaves have a tapered tip that measures around 3-15cm long, and their surface is covered in veins. You might find tiny clusters of flowers at the base of each pair of leaves (see image at top of page).

Why do nettles sting?

Stinging nettles attract the likes of caterpillars, ladybirds, and hedgehogs, who will either use them as food plants or for shelter. Science & Plants for Schools (SAPS) explains that stinging nettles have developed stinging hairs (cells) as an adaptation to deter herbivores from eating them, and as a protection against predators.

The hollow hairs on a stinging nettle cause the sting when you brush against them, and the tip breaks off. Abbas Kanani, a pharmacist at Chemist Click, compares the nettle hairs to needles, as chemicals flow through them to cause the reaction when you are stung. These chemicals include histamine and formic acid.

Symptoms of a nettle sting

Nettle sting

If you have been stung by a nettle, your skin is likely to be itchy and you will feel a burning sensation. There will be raised bumps or hives in the area of the sting, which are often light in colour and can be up to 1cm wide.

The severity of your symptoms depends on how much of your skin has come into contact with the nettles. You might also experience:

• Swelling.

• Redness.

• Blisters.

• Local numbness.

How to treat a nettle sting

If there isn't a severe reaction, you can treat a nettle sting easily yourself. Often dock leaves are near stinging nettles and these can soothe the sting (see below). However, if not close to hand, we have some tips!

You should avoid touching the rash for the first 10 minutes after being stung as it is easier to remove if the chemicals are allowed to dry on the skin. Touching or rubbing the sting immediately could cause a more severe reaction if the chemicals are pushed deeper into the skin.

If irritation continues beyond 24 hours, avoid scratching or aggravating the sting further. For additional relief, you can apply a cool compress, but be sure to dab, not rub.

Does a dock leaf help a nettle sting?

Dock leaf

You might have heard that a dock leaf can ease a nettle sting reaction. Kanani confirms that this is true. Despite scientific research into the treatment being extremely limited, it has been used as a means of treating nettle stings successfully for hundreds of years with its anti-inflammatory properties.

"The cooling sensation of the dock leaf sap evaporating from the affected skin can help reduce some of the stinging sensation," she says.

You can usually find dock leaves in the same areas as stinging nettles.

When should you contact a doctor about a nettle sting?

In rare cases, a nettle sting can have more severe effects, such as an allergic reaction.

You should seek medical attention if your sting leads to any of the following reactions:

• Difficulty breathing.

• Tightness in the chest/increased heart rate.

• Feeling of a closing throat.

• Trouble swallowing.

• Swollen tongue and/or lips.

• Rashes in areas that didn't come into contact with the nettle.

• Vomiting.

• Wheezing and coughing.

• Stomach ache.

• Diarrhoea.

In these instances, responding swiftly and seeking medical attention as soon as possible are essential, as these complications can be life threatening and sometimes require immediate attention.

How long do nettle stings last?

Fortunately, nettle stings don't tend to last long. The itching and burning sensation usually settle down within a few minutes, but this could last for a few days, depending on your reaction. There's a chance of the sting leaving a raised nettle rash on the skin.

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How to prevent nettle stings in future

Avoiding stinging nettles completely might not be possible if you need to pick them. You might do this to include in recipes, or as a natural remedy for aches and pains. Some people - such as farmers - pick the nettles with their bare hands after years of building up resistance and learning to not break the hairs, but this isn't advised.

Picking stinging nettles safely

If you are picking nettles, the safest method is to be aware of where the hairs are on the leaves and keep your hands near the top of the plant, where the leaves are smaller and less likely to brush against you.

Grab the leaf quickly and firmly from the direction the hairs are growing. Once you have pinched the leaf, twist it and pluck off the plant. This method does not guarantee that you won't get stung, so you should make sure you wear gloves at all times.

Also, do some research on where the stinging nettles might be before you go rummaging around, in case you brush against one unexpectedly.

"Plants in full shade tend to have fewer hairs than plants grown in the sun, reducing your chance of being stung if you are touching stinging nettles in shaded, dull areas," adds Kanani.

"If you do want to get close to a stinging nettle plant, don't run your hand into the tips and make sure you use force when grabbing it.”

Avoiding being stung by nettles

When it comes to everyday life, to avoid nettle stings, it's a good idea to avoid overgrown paths or venturing into long grass when out for walks. If you do end up in these areas, it's advised to wear long clothing that covers your arms and legs. On a hot day, this might just be something cotton and breathable that will still keep you cool.