You probably don’t think of bruising when it comes to bug bites. Red marks, welts, and itching are the most common symptoms of insect bites. However, bites from bugs like spiders, hornets, wasps, mosquitos, and ticks may cause bruising.
This article explains bug bites that can leave a bruise, bug bite symptoms, treatment, and possible complications.
What Kind of Bug Bite Leaves a Bruise?
Various insects can leave behind a bruise after they bite. Sometimes, this reaction is from the injury; other times, it merely appears bruised as the bug bite darkens.
Spiders
It is not typical for non-venomous spiders to leave a bruise after biting. However, if you are bitten by a venomous spider, like a black widow or a brown recluse, the bite site may turn from red to purple.
In addition to a bruised appearance, other symptoms of a venomous spider bite include:
- Itching
- Pain
- Sweating
- Trouble breathing
- Headache
- Nausea or vomiting
- Fever, chills
- Anxiety
- Hypertension (high blood pressure)
Bees
Bee stings—especially those from hornets and wasps—are painful. While not a primary symptom of a sting, a bruise may occur around the sting due to the injury.
Venomous spider bites require immediate medical attention.
Other symptoms of hornet and wasp stings include:
- PainRednessSwellingItching
Mosquitos
Mosquitos are well known for their red welts and itching. But, bruising can also occur, especially in people with a mosquito allergy, known as “skeeter syndrome." Skeeter syndrome is not typically a life-threatening allergy.
Allergic Reactions
Signs of an allergic reaction include flushing, hives, dizziness, trouble breathing, and loss of consciousness.
Other symptoms include:
- Large areas of swellingHeatRednessItching
Ticks
Tick bites are painless, which is why it’s essential to check your body after time outdoors in tick-infested areas. When a tick embeds in your skin, the site may appear red or purple.
Skeeter syndrome usually improves in a couple of days. If your symptoms worsen or last longer, seek medical attention for a possible skin infection.
After the bite, a skin rash is common, especially in the case of a tick-borne illness. The rash can look like a bullseye and is often pink or red, but it can be darker in color, too.
Other symptoms of a tick-borne illness include:
- Fever
- Chills
- Headache
- Fatigue
- Muscle aches
Be aware that tick-borne illness symptoms can take up to a few weeks to develop. If you experience any of the above symptoms after you’ve spent time outdoors, speak to a healthcare provider.
Other Symptoms of Bug Bites
Bug bite symptoms vary; however, they often share some common traits. These include:
If a bruise is accompanied by allergy or poisoning symptoms, like difficulty breathing, wheezing, nausea, or confusion, seek medical attention immediately.
- RednessWeltsHivesPainItching
Causes of Bug Bite Bruises
Often the cause of purple skin around a bug bite is your body’s reaction to the saliva or venom from the insect. For example, when a mosquito sucks your blood, it injects saliva into your skin. This fluid exchange produces an itchy rash in most people, and it can also lead to a bruised appearance.
What Is Anaphylaxis?
Anaphylaxis is a life-threatening allergic reaction that requires immediate medical attention. Symptoms include:
Other times, like with a bee sting or spider bite, when the venom releases into the skin and surrounding tissue, it causes pain and inflammation. These reactions can sometimes lead to bruising.
Some insect vectors (those responsible for spreading human disease), like ticks, may cause a rash that appears purple. These rashes are unlike other bug bite reactions because they indicate a systemic (body-wide) infection rather than a localized skin reaction.
Treatment
Usually, bug bites are a minor nuisance, but sometimes they can be more concerning. Therefore, the first step in treating a bug bite is identifying the culprit since this may determine the actions you take.
If you have a non-venomous, allergic, or infectious bite, the following is recommended:
- Take an over-the-counter (OTC) pain reliever for pain.
- Apply an ice pack to reduce swelling and pain and to relieve itching.
- Use OTC anti-itch cream, if needed.
- Take OTC antihistamine for itching.
In addition, take preventative measures to avoid insect bites by using insect repellent with DEET when spending time outdoors and keep your skin covered with clothing.
Complications of Bug Bites
Complications from bug bites include allergic reactions, skin infections, poisoning, and necrosis (skin and tissue death).
Allergies
Allergies to stings and bug bites require immediate medical attention. Signs of an allergic reaction include:
- FlushingHivesSwellingDizzinessTrouble breathingNauseaLoss of consciousnessShock
Skin Infections
Since bug bites break the skin, they can lead to an infection. Symptoms of a skin infection include:
Around 15% of fatalities from anaphylaxis (severe allergic reaction) are from venom allergies.
- RashSwellingRednessPainPusItching
Necrosis
Necrosis is when an infection results in the death of skin and surrounding tissues. This kind of infection is more likely with venomous spiders. Necrotizing infections are dangerous and require immediate medical attention. Symptoms include:
- SwellingBlistersSkin that turns violet or blackHigh feverRapid heart rateConfusionUnconsciousness
Poisoning
Not all spider bites can make you sick, but some can. Symptoms of a venomous bite include:
- PainSwellingNecrosisFeverTrouble breathing
Seek medical attention immediately if you experience the above symptoms following a spider bite.
Summary
Some bug bites can cause a bruise or a bruised-like appearance. Insects that may cause bruising include mosquitos, ticks, bees, and spiders. Often a bruise isn’t a cause for alarm, but keep an eye out for allergy symptoms, skin infections, necrosis, and more after an insect bite or sting. If any of these warning symptoms accompany your bug bite bruise, seek medical attention right away.
A Word From Verywell
Most of the time, bug bites are nothing but a minor nuisance. However, sometimes they can be more concerning. If you’ve been bitten or stung, keep an eye out for concerning symptoms. If you aren’t sure whether to be concerned, it’s best to err on the side of caution and seek medical advice.
Frequently Asked Questions
- Is it dangerous if a bug bite turns purple?
- It’s not necessarily dangerous if a bug bite turns purple. Sometimes, bug bites can bruise from the injury. However, in some cases, it can be cause for concern, because it can be a sign of necrosis (skin and tissue death). If purple skin is accompanied by infection or allergy symptoms, seek medical attention.
- Learn More:
- Causes of Bruising
- How do you identify a spider bite?
- Identifying the type of insect that bit you is not always straightforward. However, some things can offer clues. For example, if you were bitten inside, and the bite is painful, it may have been a spider. If the spider was venomous, you might notice further symptoms, like swelling, necrosis, fever, or trouble breathing.
- Learn More:
- Spider Bite Symptoms
- Can mosquitos bite through clothes?
- Yes, mosquitos can bite through clothing. While covering exposed skin is a good precaution, using insect repellent is also a good idea.
- Learn More:
- Natural Mosquito Repellent
It’s not necessarily dangerous if a bug bite turns purple. Sometimes, bug bites can bruise from the injury. However, in some cases, it can be cause for concern, because it can be a sign of necrosis (skin and tissue death). If purple skin is accompanied by infection or allergy symptoms, seek medical attention.
Identifying the type of insect that bit you is not always straightforward. However, some things can offer clues. For example, if you were bitten inside, and the bite is painful, it may have been a spider. If the spider was venomous, you might notice further symptoms, like swelling, necrosis, fever, or trouble breathing.
Yes, mosquitos can bite through clothing. While covering exposed skin is a good precaution, using insect repellent is also a good idea.
