The wart has started bleeding
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If your wart has begun to bleed this means that it's injured! All warts have a blood supply so when they are injured the blood supply is damaged and this can be hard to stop. It's important to get checked out if this happens as the bleeding can just carry on and on.
Your wart is growing
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If the wart is not treated correctly it will begin to grow and develop on the skin. A wart can grow up to 60% if it is not treated correctly and this is why growth is a warning sign it is out of control. If your wart begins to grow it might means the infection is growing too!
You have diabetes
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Due to the reduced blood flow that is caused by diabetes it is worrying when warts grow on feet. This is because warts require a blood flow so this reduces the blood flow even more to a diabetic's feet. Reduced blood flow can result in foot amputation if not treated.
You've shaved over the wart

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Shaving left your wart bleeding and sore? This isn't just uncomfortable, it also means that the wart is now open for infection. Without the protective hard layer the wart is open to any nasty infections and this can become pretty serious if not treated.
People around you now have warts
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Warts are extremely contagious and if they aren't treated the infection will migrate onto surfaces you touch. This means it's not just a coincidence if your partner also has a wart at the same time as you. Treating a wart as soon as it appears will stop this.
You have multiple warts on your body
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Warts can spread to other people but they can also multiple on yourself too. When touching a wart the virus is on your hands meaning if you rub another area the chances of it spreading is pretty high. It's important to wash your hands regularly to stop this happening.
You're in a lot of pain
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If the wart is causing pain it could be a sign that your body is struggling to fight the infection the wart has caused. Most warts do not cause pain but when they do it's important to get a doctor to check this out. It might just be that it's infected!
There's pus coming out of the wart
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When the wart has pus inside it this is a warning sign that it is infected with bacteria. This bacteria infection can become pretty dangerous when the infection gets into the blood stream. To stop this it's vital the wart gets treated as soon as possible.
Scabbing has begun to form on the wart
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Although a wart scabbing may suggest that it is starting to heal and break off it can also be a warning sign that scarring is about to happen or the infection has spread. The scab can suggest that the wart has been injured causing an infection to grow and become dangerous.
The wart is in a sensitive part of the body
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Warts in the nose are not only uncomfortable but also pretty dangerous. In areas like the nose warts can result in tumors growing and these can be cancerous. Any wart in areas like the nose should be examined as soon as they appear to check for this.
You have a low immune system
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It's vital your immune system is strong enough to fight the infection when you have a wart and this is because of the infection inside the body. If you have a lower immune system the body can't get rid of the infection and this is dangerous in itself.
They keeping going and coming back
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When a wart appears in the same place it means that the virus has not been killed the first time. It can also suggest that the wart has grown with a strong blood supply that the body can't fight on its own. To stop this getting out of control medical attention is often needed.
You have a B12 deficiency
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When you have a B12 deficiency the immune system is not as strong and has to work harder. Having a wart with this deficiency makes it harder for the wart to be treated. This does mean that a wart may not grow without medical intervention and become dangerous quickly.
You are feeling stressed
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Stress causes warts to grow because the physical effects stress has on the body. When warts begin to grow because of stress the body can find it hard to control the virus, causing more to grow. To get on top of this stress techniques and medical intervention can be beneficial.
The wart smells bad
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A prime example of a dangerous and infected wart is a bad smell coming from it. This smell is literally the smell of the virus being infected and is extremely dangerous. As soon as you see pus this is a serious sign that the wart has become dangerous.
There are black pinpoints in the wart
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Black pinpoints in a wart are a huge sign that the wart is full of nutrients and oxygen. The nutrients are being drained from your body and is a sign that the body will be lacking in the vitamins it needs to run properly. The more black pinpoints the worse it is.
You can't stop picking it
Image Source/RedditCan't stop picking at that wart on your hand? You are making it worse! As much as it's easier said than done the worst thing you can do is pick at a wart. Picking the wart will make it spread around the infected area and make it more prime to gain infection.
You feel sick

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If you're feeling sick and have a pesky wart then the virus from the wart may have spread into your blood stream. The virus HPV will usually stay in the infected area but overtime if not treated this will mix into the whole body. It's important to treat the wart to stop this.
It's difficult to walk
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Depending on where the wart is located your walking may be affected which creates a big mobility issue. Having a wart on the bottom of your foot will feel like walking with a pebble stuck to the bottom if left untreated. Warts on the foot cause great discomfort and can be dangerous.
The skin is scarred
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When a wart falls off it can leave a serious scar on the skin. This scarring can ruin the protective level of your skin and leave you prone to infection or serious injury. It is important to ensure that before the wart falls off it gets treated.
The skin has begun to turn yellow
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Due to the effect a wart has on the skin it is common that the skin around the wart can become yellow. This pigmentation is caused by the foreign wart on the skin and the pressure it causes. Unfortunately even after the wart is gone this yellow colouring may not go.
You don't have great hygiene
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Finding it hard to make time for that shower? It might just save you from getting a nasty infected wart. Poor hygiene is a common reason for wart infested skin. Not only this, poor hygiene makes the warts more prone to serious viruses that can be dangerous to your health.
The wart is shiny
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Shiny looking warts can be very painful and be prone in children. If you have a shiny wart it could be Molluscum contagiosum which if left untreated can become infected. This type of wart is very contagious and the worst thing you can do is try and pick at it.
You have tried the home remedies
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You've tried the acid or the duct tape and that wart still isn't going anywhere? There's a chance there's more to the wart than what meets the surface if this is the case. Warts that do not budge could have dangerous cancerous cells so they must be checked.
You are suffering with nerve damage
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Depending on the severity of the wart you may begin to see symptoms of nerve damage happen to your body over time. This is all due to the blood supply and pressure caused by the wart itself. It's important to see a doctor if you appear to be having any nerve issues.
You bite your nails
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Your bad habit might just be putting you at risk of a serious infection! When you bite at your nails that are infected by warts you are literally putting the virus in your body orally. Biting your nails will keep the virus in the body for longer and make it spread.
You're seeing signs of infection
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When the wart becomes infected this affects the bloody supply around this area. Having infected blood is very serious and can lead to sepsis which is life threatening to anybody. Warts should be treated before it they have any chance of becoming infected.
Your skin is itchy
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Warts are dried out and can be irritated which creates that strong need to itch the skin. By itching the skin though you are spreading the virus around. If the wart continues to feel itchy you should see a doctor to ensure it is not a form of skin cancer.
You have a cluster of warts
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A cluster of warts is a prime example that the wart virus has spread. If this is not treated then the warts will continue to grow around the body. This is not only a good look but also means you don't have control of the virus and needs serious attention.
Your wart is grey
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If the wart becomes grey this is a big sign that the wart is dangerous and must be treated. A doctor will suggest having a screening on the wart for any cancerous cells if this is a symptom you have. As soon as it appears to be grey you probably want to seek a doctor's help.