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Doctor insights on: Healed Scab Turns To Blister On Knee

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I fell a few months ago and got a cut near my knee, turned to a scab, then a blister. I reinjured it a month ago and there's still a reddish hard blister-like lump that doesn't seem to contain liquid, but it hasn't gone away? Should I be patient?

I fell a few months ago and got a cut near my knee, turned to a scab, then a blister. I reinjured it a month ago and there's still a reddish hard blister-like lump that doesn't seem to contain liquid, but it hasn't gone away? Should I be patient?

Depends: I would take a photo or see a doctor for a consult. Without being able to see the scab/blister it is difficult to say. Keloids can form at a scar trauma area or it could possible be a funucle. Can't say without knowing more information ...Read more

Dr. Philip Miller
1,737 Doctors shared insights

Blistering (Definition)

A blister is a collection of fluid under the epidermis. A blistering rash is one in which ...Read more


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I have a blood blister on my knee that has been there for about 3 months. What should I do to heal it?

I have a blood blister on my knee that has been there for about 3 months. What should I do to heal it?

Blood blister: See a physician--anything not resolving for 3 months needs further expert evaluation, not "cookbook" remedy ...Read more

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I have a blister that has appeared on a scar that that has healed from a scrape on my knee. The incident occurred about a month. Blister is 3 days old

I have a blister that has appeared on a scar that that has healed from a scrape on my knee. The incident occurred about a month. Blister is 3 days old

Check it out!: Either your doctor, a walk-in clinic or a good pharmacist can help determine infection that needs treatment. It would be foolish to risk a blood infection (from a simple scrape.) also, poorly healing small injuries could indicate something beginning to go awry in your body - blood sugar levels, other biochemicals, etc may cause some lab tests & early detection & easier treatment. Good luck. ...Read more

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On the outside, my knee looks normal. But when I bend, it feels like a scab is tearing underneath and re-injuring itself. How can I heal it?

On the outside, my knee looks normal. But when I bend, it feels like a scab is tearing underneath and re-injuring itself. How can I heal it?

Knee pain: Did you have an acute injury? If not could be tendonitis l patellaofemoral syndrome, chondromalacia patella or meniscus pain. Would rest knee ice 10 minutes 4 x a day, elevate, try NSAIDS, use support like brace and or kinesiotape, consider xrays or MRI for diagnosis and follow up with doctor/ urgent care. ...Read more

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I scraped my knee and it scabbed and healed leaving a scar. I now have a blood blister on my scar. Related? I am very active at the gym fyi

I scraped my knee and it scabbed and healed leaving a scar. I now have a blood blister on my scar. Related? I am very active at the gym fyi

Blister after Scrape: It is very important after getting abrasions to get the skin back to normal healthy tissue. Please see your primary or an orthopod to eval the blister, and make sure you are not getting an infection. You need advice on how to reduce the abnormal tissue and gradually return to a healthy skin. Dr Rich Blake ...Read more

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I had a below the knee amputation. I have a blister like spot that oozes a little blood & won't heal. My vascular surgeon is talking above the knee revision. Is this necessary for a smal blister that just seems like it needs more skin over it. I have good

I had a below the knee amputation. I have a blister like spot that oozes a little blood & won't heal. My vascular surgeon is talking above the knee revision. Is this necessary for a smal blister that just seems like it needs more skin over it. I have good

This: This is a tough question to answer without more information. How small is "small"? Where is the blister located? Are you wearing a prosthesis? How long has it been since you first saw the blister? How were you able to determine that you have good circulation?

Without this information, I would suggest that if the blister is not infected and is not causing pain and doesn't limit your ability to wear a prosthesis, local wound care would be reasonable with the expectation that it may never heal, or heal very slowly.

If you are able to provide more information, myself and other physicians may be able to advise you more appropriately. ...Read more

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How do get rid of a scab on my knee?

How do get rid of a scab on my knee?

Be patient.: With time the scab will come off by itself. If you remove it before it is ready to come off you are at greater risk of developing a scar. ...Read more

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I have a blister that's huge on my right knee filled with puss. What should I do?

I have a blister that's huge on my right knee filled with puss. What should I do?

Go to Doctor: You have an infection that is a risk for going into your joint. Do not delay! ...Read more

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I scraped my knee really badly. Will picking at the scab make it scar more?

I scraped my knee really badly. Will picking at the scab make it scar more?

Knee abrasion scab: It is better to leave the scab alone as it will fall off by itself. If you prematurily try to remove it, may cause bleeding and infection at the site. ...Read more

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My son woke with a blister type looking thing on his knee this morning. Looks like it was oozing something because fuzz was stuck to it.?

My son woke with a blister type looking thing on his knee this morning. Looks like it was oozing something because fuzz was stuck to it.?

Wash and neosporin: It was likely a scrape that boys are prone to get. Wash site gently with soap and water and apply a neosoprin bandaid. ...Read more

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I fell down the other day and grazed my knee, washed it straight away. A scab is forming and part of it is yellowy-green. Could it be infected?

I fell down the other day and grazed my knee, washed it straight away. A scab is forming and part of it is yellowy-green. Could it be infected?

Skin infection: It could be infected. If you have swelling, tenderness and heat in the area this is an indication of a deeper infection. One of my favorite treatments for superficail wounds is acetic acid, which is white vinegar. 1/3 cup to a pint of water. Soak for a few minutes and apply antibiotic ointment if you are not allergic to it. ...Read more

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I have a blood blister appear on my knee for no reason?

I have a blood blister appear on my knee for no reason?

You most likely had: Some un-noticed trauma! If this happens again or they appear elswhere on your body or if you are bruising excessively get this checked out ASAP
Hope this is helpful! '
Dr Z ...Read more

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Itchy small blisters in the back of my left knee, from 4 days. Is it serious?

Itchy small blisters in the back of my left knee, from 4 days. Is it serious?

Contact dermatitis?: Do you have poison ivy in your area? Did you come in contact with plastic, metal, or chemicals in that area of your leg? It sounds like your skin may be reacting to something it came in contact with. If it is painful, or has a cloudy pus-like discharge, or you have fever, get seen to rule out infections. Otherwise, wash it well and try hydrocortisone cream 2x/day. ...Read more

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I had stitches in my knee & it's been 2 weeks & I can't tell if it opened back up or not. It's bleeding but I think it's just from the scab?

I had stitches in my knee & it's been 2 weeks & I can't tell if it opened back up or not. It's bleeding but I think it's just from the scab?

Get it checked.: It can be a wound hematoma (blood collection). Hematoma or wound dehiscence (incision separation)can become a nidus for infection and need to be drained and washed out at times. Your doctor will make that decision, but he need to have a look at it. So show it to him as soon as possible, since Joint or knee infections have to be treated seriously. ...Read more

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Son 8, possibly had untreated strep 4 weeks ago. Has no pain or fever but has pink blister on his knee could it be a beginning of a complication?

Son 8, possibly had untreated strep 4 weeks ago. Has no pain or fever but has pink blister on his knee could it be a beginning of a complication?

Depends...: ...On where the possible strep infection was. If throat, it could also have been viral. A pink blister doesn't sound like any sort of complication, but it could be a new infection, and if it persists you should let your doctor see it, and if necessary culture it. ...Read more

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I've got a mole like scab on the underside of my knee. It looks and feels like a mole but it peels off periodically like every couple months. What is it?

I've got a mole like scab on the underside of my knee. It looks and feels like a mole but it peels off periodically like every couple months. What is it?

Mole-like scab: The only way to know what your are dealing w/is to see your doc or a dermatologist. He/she can biopsy it and you will know. Peace and good health. ...Read more

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Itchy clustery rash on hands knees elbows and feet that blister wen scratched?

Itchy clustery rash on hands knees elbows and feet that blister wen scratched?

Psoriasis?: Although it is very difficult to diagnose rashes without actually looking at it. But it sounds like early psoriasis by the distribution and description that you have given. Please consider uploading pictures and consulting a dermatologist here on HealthTap. ...Read more

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I've multiple scabs on my knees for many months, sometimes flaking off or tearing and bleeding, they seem deep and will not scar, nothing I've tried w?

I've multiple scabs on my knees for many months, sometimes flaking off or tearing and bleeding, they seem deep and will not scar, nothing I've tried w?

Question cut off: Not sure of question. However, if these are not related to trauma - then please see dermatologist for evaluation. ...Read more

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I have 3 decent sized blisters on my right leg near my knee. They have fluid and the skin around it is irritated and gets bigger.

I have 3 decent sized blisters on my right leg near my knee. They have fluid and the skin around it is irritated and gets bigger.

Blisters: Sorry to hear this. Please have someone take you to the nearest Emergency facility. They will either be able to fully take care of you or they may decide - after blood work and xray- to send you to the Hospital for care.

Hope all goes well! ...Read more

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I found a strange circular scab that's red around and dried out in the middle. Its located above my knee cap on my right leg. Is it serious?

I found a strange circular scab that's red around and dried out in the middle. Its located above my knee cap on my right leg. Is it serious?

Derm lesion: I recommend seeing a dermatologist if it doesn't resolve, is painful or itches. Lesions that are concerning to you need to be evaluated by a specialist as it is difficult to diagnose these lesions over the internet and could be benign or something more serious. ...Read more

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There is a small patch of blisters on the back of my leg where my knee bends. It is also has a huge red rash around it. My leg also hurts to bend.?

There is a small patch of blisters on the back of my leg where my knee bends. It is also has a huge red rash around it. My leg also hurts to bend.?

Get examined: For further evaluation of possible bacterial or viral infection. Cannot be diagnosed without direct visualization. ...Read more

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I am a below knee amputee using prosthesis. Some time my back portion of stump starts burning and on further use of prothesis it develope to blister.

I am a below knee amputee using prosthesis. Some time my back portion of stump starts burning and on further use of prothesis it develope to blister.

Prosthetic fit: These are common signs of an ill fitting prosthesis. The residual limb after an amputation often changes shape and the prosthetic socket needs to be modified or replaced. Contact your prosthetist or physical rehabilitation physician for evaluation. Once the possibility of an ill fitting prosthesis is determined your physician can investigate other possible causes. ...Read more

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My 2 year old son has a few blister like spots on his hands and on his knees. Yesterday there was just a few light spots on his knees which I thought were bites but now it has gotten worse and spread. What can this be?

My 2 year old son has a few blister like spots on his hands and on his knees. Yesterday there was just a few light spots on his knees which I thought were bites but now it has gotten worse and spread. What can this be?

Blisters on toddlers: It can be form any of the multitude of causes! Does he have fever and runny nose or cold symptoms? Are all his immunizations current for age including varicella shot.
Does it look like insect bites? Has he ben expsoed to some body with similar rashes?

Your best bet would be to see his pediatrician. ...Read more

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My wife scraped her knee 5 days ago, it still bleeds a little and there is no scab and she is still in pain. What do we need to do, ?

My wife scraped her knee 5 days ago, it still bleeds a little and there is no scab and she is still in pain. What do we need to do, ?

Best to see Dr: Pain 5 days after an unjury should be evaluated and that way you will get a diagnosis and the most appropriate treatment. Good luck. ...Read more

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Rug burn on knees yellow gooey scab was leaking clear liquid out of one?

Rug burn on knees yellow gooey scab was leaking clear liquid out of one?

May or not be infec: This could be an infection. We see staph infections including MRSA. See your physician to have it cultured ...Read more

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My son has blisters all over his knee after using an ice pack. Looks like a burn. Should he see a dr?

My son has blisters all over his knee after using an ice pack. Looks like a burn. Should he see a dr?

Ice burn: Ice can cause as much or more damage than heat. When an ice burn blisters, it indicates there is a burn that extends through a skin layer. You get him (his knee) into warm water between 104 and 106 degrees and observe, the area should begin to pink up, feel numb and tingling and then regain sensation. If this does not happen, he needs immediate medical attention. ...Read more

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Hi, I woke up with an itchy red rash on back of knee. Looks inflamed w/ brown dots & little scabs on the follicles. Used cortisone 3 days, not better?

Hi, I woke up with an itchy red rash on back of knee. Looks inflamed w/ brown dots & little scabs on the follicles. Used cortisone 3 days, not better?

See Specialist!: It could be a general contact dermatitis. If after 3 days of using an anti-inflammatory cream with no relief, I recommend getting it looked at in person. If you have any symptoms such as increased redness, swelling, fever or nausea, make sure you seek medical treatment immediately! Get better soon! ...Read more