Insect bites and stings on the rise

The current heatwave in the UK has provided perfect conditions for a wide range of biting and stinging insects to thrive – and this has been demonstrated by the huge increase in medical help being sought for insect bites and their complications. Twice the usual number of calls to NHS Direct (111) have been made recently regarding this issue, and there has been a spike in hospital admissions to treat infected bites, particularly horsefly bites. (1)

In light of this news, this blog explores some of the most common insect bites and stings in the UK, highlighting what to look out for and how to manage them.

Horseflies are common in the UK, and as the name suggests they do bite horses, but also other mammals including humans. If you’ve been bitten by a horsefly you’ll know about it! That’s because not only do horseflies tend to ‘hone in’ on their targets by buzzing round them before finally finding a place on their body to land and bite, but their razor sharp mouthparts dig in to the skin, tearing rather than piercing it to extract as much blood as possible. This will be particularly painful and leave a nasty looking raised red bite which takes longer to heal than most other insect bites. Because of this, the bite can become infected. Look out for pus appearing in or from the bite, worsening pain, fever, or redness and swelling spreading from the bite to the surrounding areas – see your GP if you notice any of these symptoms as you may need treatment with antibiotics. (1, 2)

Mosquitoes are also abundant and particularly favour areas with standing water, such as those near lakes and ponds, but they can be found in other areas too. Generally, people do not realise they have been bitten by a mosquito until a rash develops, as their bite is painless. The bites appear as small red lumps which may contain fluid-filled sacs and can be intensely itchy. (1, 2)

Bees tend to keep themselves to themselves as they travel between flowers collecting pollen. They will usually only sting if they feel threatened. A sharp, piercing pain is felt and a small red mark may be left which often contains the bee sting. It is important that the sting is removed as soon as possible as it is venomous. Scrape the sting out using an object with a thin, hard edge, such as a bank card, or your fingernail. Do this in a sideways motion to draw the sting out of the wound. Don’t try to pluck or squeeze it out as this may release more venom into the surrounding tissue. (2, 3)

Wasps and hornets can be more bothersome, attacking people who are just keeping themselves to themselves! Also, they may sting more than once at a time. The sensation will be similar to a bee sting, but there is no sting left in the wound. Within hours, a red, painful and itchy lump can form around the sting wound, and in some cases the irritation and swelling can cover a considerable area for up to a week as part of a mild allergic reaction. (2)

Bee, wasp or hornet stings can occasionally cause serious allergic reactions (anaphylaxis). If you or someone around you begins to struggle breathing, experiences severe swelling on the face (mainly around the eyes and lips), or dizziness after being stung, call 999 immediately. (2)

Ticks are tiny spider-like creatures which can leave a small red, itchy bite and sometimes a blistered or bruised surrounding area. The bite doesn’t tend to cause any pain, so you may not notice you’ve been bitten. In the UK, ticks are generally harmless unless they carry Lyme disease (covered in more detail in an earlier blog), in which case a characteristic ‘bullseye’ rash may develop. See your GP if this happens.

To ease itching, apply calamine lotion or crotamiton cream to the bites or stings. You can also purchase hydrocortisone cream and antihistamines such as chlorphenamine or loratadine over the counter. Painkillers such as paracetamol can be taken to ease pain associated with stings or bites. Applying a cold compress to the affected area can help to reduce swelling. (3)

Continual scratching of the stung or bitten area can break the skin, which makes infection more likely. Signs of infection include pus or yellow crusting, spreading of the red and swollen area, worsening pain and fever. Don’t hesitate to contact your GP if this develops as you may need antibiotics to clear the infection.

If you’ve been stung or bitten in a sensitive area, such as inside the mouth or near the eyes, or if you experience worsening symptoms or see no improvement after a few days, see your GP or call NHS 111. (3)

To learn more, there is a great article called Bug Bite Identification - The 10 most common bug bites and how to identify them. It starts by explaining why bugs bite and then how to identify if you really have a bug bite. It goes on to venomous versus non venomous bites and when to seek medical attention. (4) 

References

1. Ives L (2018).Heatwave causes spike in insect bite calls to NHS [cited 18 July 2018]. Available at: https://www.bbc.co.uk/news/health-44823286

2. NHS Choices. Insect bites and stings – Symptoms [cited 18 July 2018]. Available at: https://www.nhs.uk/conditions/insect-bites-and-stings/symptoms

3. NHS Choices. Insect bites and stings – Treatment [cited 18 July 2018]. Available at: https://www.nhs.uk/conditions/insect-bites-and-stings/treatment

   4. Bug Bite Identification - The 10 most common bug bites and how to identify them. [cited 26 July 2020]. https://howigetridof.com/bug-bite-identification/

   Author: Gabby Gallagher MPharm

   Medically reviewed by: Superintendent pharmacist Margaret Hudson BSc(Hons)MRPharmS 08/07/18

   Update: 21/11/20 by Margaret Hudson