This guide explains what blisters are, why they happen, how to treat them safely, and when it’s best to see a podiatrist.
Quick summary:
Most foot blisters should be protected with a sterile blister dressing, kept clean and dry, and left un-popped so the skin can heal naturally. You should see a podiatrist if the blister is infected, very painful, recurring, slow to heal, caused by footwear pressure, or if you have diabetes, poor circulation, neuropathy, or a weakened immune system.
What is a blister?
A blister is a small pocket of fluid trapped between the upper layers of your skin. It forms when the skin experiences pressure, heat, or friction, causing the top layer to separate from the layer beneath it. Your body sends fluid into that space to protect the area and support healing, helping prevent deeper tissue damage.
- Blisters can vary depending on the cause and severity:
- A clear fluid-filled blister (the most common type).
- A blood blister caused by deeper friction or pinching.
- A torn or flattened blister if it has burst.
- A yellow or cloudy blister which may indicate infection.
- The surrounding skin may also appear red, warm, tender, or swollen.
Why do we get blisters with new shoes?
New shoes often cause blisters because they haven’t yet moulded to your foot shape. Some common reasons include:
- Stiff materials rubbing against the skin.
- Shoes that are too loose or too tight.
- Seams or edges pressing on bony areas.
- Socks that bunch or slide.
- Increased moisture and heat in the shoe.
Who is more prone to blisters?
- Runners and hikers.
- People who spend long periods on their feet.
- Anyone wearing new or poorly fitted footwear.
- People with bunions, hammertoes, or other toe deformities.
- People with flat feet or high arches.
- People who sweat excessively through their feet.
- People with diabetes.
Why is it important NOT to pop a blister?
Popping your blister is a big “DON’T.”
The top layer of skin works as a natural sterile dressing. Popping a blister will remove that protection and increases the risk of:
- Infections.
- Slower healing rate.
- Increased pain.
- Deeper skin damage.
A blister can be drained but only in a sterile environment when it’s very large, extremely painful and likely to tear on its own. Otherwise, it’s left to heal on its own.
How to treat / manage a blister?
Do
- Protect the blister with a blister dressing.
- Reduce pressure and friction using padding, gel sleeves, or other offloading techniques.
- Keep the area clean and dry.
- Wear appropriate footwear.
Don't
- Pop the blister.
- Peel away the skin covering the blister.
- Continue wearing the shoes that caused the blister.
- Ignore signs of infection.
If the blister bursts on its own
- Clean the area with sterile saline.
- Leave the skin flap in place.
- Apply a sterile dressing.
- Keep it protected until healed.
Signs of infection
A blister may be infected if you have:
- Yellow or green fluid.
- Increasing redness around the blister.
- Warmth.
- Swelling.
- Red streaks spreading away from the blister.
- Fever.
If any of these occur, it’s important a podiatrist assess it promptly.
Blisters in people with diabetes?
Blisters require extra attention in people living with diabetes because even minor skin damage can progress to infection or ulceration if left untreated.
People who have diabetes may:
- Not be able to feel the blister on their foot due to neuropathy.
- Be at greater risk of infection due to impaired immune function and elevated blood glucose levels.
- Heal more slowly, due to poor circulation.
Any blister in a diabetic patient should be checked by a podiatrist as soon as possible.
How to prevent blisters?
Preventing blisters depends on where they form – toes, the side of the foot and the sole all have different causes and solutions. Overall, these tips are a great place to start.
Choose the right footwear
- Wear properly fitted shoes.
- Break in new shoes gradually.
- Consider alternative lacing techniques if pressure develops in specific areas.
Wear appropriate socks
- Choose moisture-wicking materials.
- Avoid socks that bunch or slip.
- Consider double-layer socks for long walks, running, or hiking.
Reduce friction
- Use anti-friction balms before activity.
- Apply blister patches to high-risk areas.
- Consider gel sleeves or toe protectors.
Maintain good foot care
- Keep toenails trimmed.
- Manage callus build-up.
- Keep feet clean and dry.
Why do I keep getting blisters?
If blisters repeatedly occur in the same area, there may be an underlying cause beyond footwear alone.
Common contributing factors include:
- Foot shape and biomechanics.
- Bunions or toe deformities.
- Excessive foot movement within footwear.
- High-pressure areas or callus build-up.
- Activity-specific demands such as running or hiking.
A podiatrist can assess these factors and recommend footwear modifications, padding, orthotics, or other treatments to reduce ongoing blister formation.
When to see a podiatrist instead of self-treating?
- Diabetes, poor circulation, or neuropathy – with these conditions, even minor blisters can lead to infection or ulcers if not treated correctly.
- Signs of infection - Redness, swelling, warmth, pus, or increasing pain should be assessed promptly.
- Blood or under-nail blisters - These are more prone to complications and should be professionally reviewed.
- Recurring blisters - Repeated blisters may indicate footwear, gait, or pressure issues that need addressing.
- Large or slow-healing blisters - Blisters that are large, deep, or not improving within a week should be assessed.
- Pain affecting walking - If a blister changes the way you walk, treatment can help prevent further injury.
- Weakened immune system - Those with reduced immunity (from illness, medication, or treatments like chemotherapy) should avoid self-treating and seek professional care.
Expert care for ongoing blister problems
While many blisters heal without complication, recurring or painful blisters are often a sign of an underlying issue with footwear, foot shape, or biomechanics.
At Umina Podiatry, we can assess the cause of your blisters, provide appropriate treatment, and help prevent them from returning. Whether you're dealing with blisters from sport, work, new shoes, or an underlying foot condition, our team can help keep you comfortable and active.
If you're experiencing persistent or recurrent foot blisters, book an appointment with our podiatrists today.
or call our friendly staff
on (02) 4342 2878
Where can healthy feet take you?
