Knotty lump & Bump On Bottom of Foot – What Are They?

Lumps & bump on the bottom of foot can be a result of many underlying disorders like plantar fibromatosis.

Usually patient refer these bumps as nodules, cyst, knot, swelling and lumps.

Whatever you name it, it is a swelling or a growth visible on bottom of foot which is resulted by an underlying pathological process within bottom of foot.

Trauma, infection, hampered distribution of weight-bearing force on foot can lead to inflammation which creates lumps on foot.

These bumps can be itchy, painful or painless, which depends upon their cause of origin.

Common causes

Causes can be identified by locating the area of nodules on bottom of foot.

  • Plantar fibromas
  • Corn & Callous
  • Plantar warts

  • Athelet’s foot
  • Foot blisters

  • Inclusion cysts
  • Porokeratoses

Plantar fibromas

Plantar Fibromatosis Or Morbus Ledderhose

Via – Wikimedia|Auth-Herecomesdoc

Also known as plantar fibromatosis or ledderhose disease.

It causes formation of small nodule within plantar fascia and usually it appear on middle part of arch of foot and affect one foot in most of the cases. While it is found that approximately 25% cases have both foot affected.

These nodules are usually benign in type but always require treatment to get relief, because it does not fade away by its own.

After clinical examination and proper imaging tests doctor will able confirm this diagnosis.

Once the diagnosis is confirmed, treatment part involves minimizing pressure on foot by rest & using foot orthotics, steroid injections and surgery.

Check out – Causes, Symptoms & Treatment of Plantar Fibromatosis 

Corn & Callous

Corn and calluses are the protective mechanism of our body to minimize destruction caused by friction over bottom of foot.

Corn and calluses are two different things and should not be confused with one another.

Corns usually appear on the side of feet and is a small patch of thick, dead skin which has central core. It can be a cause hard bump on side of foot.

A tender corn that forms at weight bearing areas of the foot is known as seed corn. Plugged ducts of sweat gland can be a cause of seed corns.

Calluses that occur at plantar region commonly known as plantar calluses.

It is mainly caused by repetitive friction on the skin, which may be triggered by high heeled shoes, ill-fitting shoes, abnormal walking motion,  standing on feet for long hours etc.

Corn & calluses can be avoided by using well fitting shoes and avoiding things that leads to friction with foot skin.

Use Mole Skin Pads minimize friction and can help to prevent corns, calluses and blisters.

Soaking foot in warm water for few minutes may help to soften the hard skin. Once it become soft use a best callus remover to get rid of hard skin from corns & calluses.

Plantar warts

Plantar Warts At Side Of Foot

Warts can grow on any part of body including lower part of foot and it can be the cause of small bumps on bottom of feet.

As they grow on plantar area, commonly known as plantar warts. It is usually caused by HPV i.e. human papilloma virus.

Most of the time these warts are not painful but as they grow, walking and standing on foot becomes difficult.

Multiple warts may grow together forming a cluster and this condition is called as mosaic warts.

Usually these kind of warts fade away by its own but if they fail to go away then some active treatment is recommended.

Using duct tape is one of the useful remedy for removing plantar warts. Apply it on wart and keep it there for approximately 5 to 6 days then remove the tape and soak foot in warm water & remove soft part.

You might need to repeat this procedure 2 to 3 times depend on size of wart.

Over-the-counter Salicyclic acid based ointment can provide results in some cases while in some cases it fails to deliver results.

Other treatment options includes freezing wart with nitrogen oxide, removing it with surgery or laser etc.

Modern medicine have very few useful options to cure warts while Homoeopathic system of medicine has shown some promising results in warts & other skin disorders.

Athelet’s Foot

Tinea Pedis - Athelet's Foot

Fungal infection between toes is known as Athelet’s foot and as name suggest it is more common in athelet’s.

Fungal infection is mostly triggered by sweaty feet and tight fitting shoes. It is commonly known as tinea pedis.

It shows typical symptoms of fungal infection like itching, blisters between toes & scaly skin.

Infection of fungus can spread person-to-person by sharing same towels or clothing.

Treatment involves using dry and clean socks, applying anti-fungal ointment and pills and paying attention to personal hygiene.

Foot Blisters

This is another reason that creates bump on foot.

Blisters are small, fluid packed sacks that looks like bubble on surface of skin.

It is caused by ill fitting shoes that rub against skin and causes blisters. Sometime it may get secondary infection.

It is advisable not to pop these blisters as they may get infected.  Instead opt for well fitting shoes and cover the blisters with tape.

Check out slide share that will help you to prevent foot blisters in future –

Via – Slideshare | Rebecca Rushton

Inclusion Cyst


A cyst that includes foreign body is known as inclusion cyst.

These foreign bodies can be be small piece of wood, glass or tiny part of metal. It can be anything. Body usually unable to expel it out and build wall around it to protect surrounding tissues.

Usually people steps on sharp object and these object breaks off in small pieces within foot tissues and get trapped inside foot tissues.

Surgical removal is the most recommended line of treatment for such cyst.

References +

Understanding Corn & Calluses -webmd.com – By Lisa Bernstein, MD on March 19, 2015

Dr. Sachin

Click Here to Leave a Comment Below 7 comments
Anjanette Johnson - May 31, 2017

I have a knot on the bottom of my right foot.It’s on the arch.Sometimes it hurts so bad that I can’t walk on my feet. I would have to wear loose fitting shoes. I don’t know what it is,but it’s very painful.please help! What must it be.

    Dr. Sachin - June 1, 2017

    You need to see a doctor to diagnose it properly, as knot can be caused by many things. We almost covered the major causes that lead to knot formation at bottom of foot.

Norine - August 2, 2017

I have a very painful, small lump under the skin on the plantar… almost directly below the point between the big toe and the next. They’re so painful at times that it hurts to walk.I never wear shoes in the house and my shoe(s) of choice are Birkenstocks, Converse, and Bear Paws, depending on the season. It’s strange that this is happening now, as I’m well into year 62 without ever having foot problems.
What do you think they are and how would I get rid of them? I just bought Yoga Gems and am using them four/five times a day.
Thank you!

    Dr. Sachin - August 6, 2017

    It’s hard to diagnose without examining that bump physically. It might be a corn, callus, wart or anything else. See a podiatrist for better diagnosis and treatment.

Marylou Octaviano - August 13, 2017

Hello! With in the past month I’ve been developing pain on the different parts of the SOLE in my feet. I can feel a very small knot (about 1/8 inch) deep inside the muscle. It does need a very deep massaging in order to feel this knot though and sure is very painful. It’s not superficial and can’t be seen but through deep massaging you i am able to distinguish and feel it. It seems that I’ve been having it at least every 1 wk. Now I have total of 4 areas in my feet [ ball part of the sole of the right foot, right side of the right sole, left sole x2. What could these be?

Melissa J Abernathy - August 14, 2017

I have just started noticing pain in my right foot in the A.M. ‘mostly’ then a few days later(this A.M.) I wake up with a blister on my left and moderate swelling. It’s painful however I can walk it just is VERY uncomfortable. The pain is mostly on the sides… Sometimes affecting more but only on the bottom. The ankle on the right was broke 19yrs ago and looks like a bump (not like the bottom) this is more taller yet smaller around. Only flares up when I’m standing up longer then usual or if I step down wrong. I don’t think it has a connection yet I wanted to make sure it was known. Thanks in advance.

Ashley - August 29, 2017

I have these large masses on the bottom of each of my feet. They are about the size of a small vending machine bouncy ball and they are very painfull. They are located right where the heels of my feet are starting. I was just wondering if you had any ideas what it may be. Please respond if you have any possibilities on what it could be. Thank you.


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