Read below about knee redness, including causes and common questions. Or get a personalized analysis of your knee redness from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

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A.I. Health Assistant Causes for Knee Redness

The list below shows results from the use of our A.I. Health Assistant by Buoy users who experienced knee redness. This list does not constitute medical advice.

  1. 1.Non - Specific Knee Rash

    A rash is an area of irritated or swollen skin. Often, rashes are unidentifiable and some variation of normal. For example, scratching one's arm causes it to turn red (which is caused by mast cells releasing chemicals into the local area), but that's completely normal.

    1-2 days

    Rarity:
    Common
    Top Symptoms:
    knee redness
    Symptoms that always occur with non-specific knee rash:
    knee redness
    Urgency:
    Wait and watch
  2. 2.Allergic Contact Dermatitis of the Knee

    Allergic contact dermatitis is a condition in which the skin becomes irritated and inflamed following physical contact with an allergen. Common products known to cause allergic dermatitis include plants, metals, soap, fragrance, and cosmetics.

    1-2 days

    Rarity:
    Common
    Top Symptoms:
    knee redness, knee itch, scabbed area of the knee
    Symptoms that always occur with allergic contact dermatitis of the knee:
    knee redness
    Urgency:
    Self-treatment
  3. 3.Skin Infection of the Knee

    Cellulitis is an infection of the skin and tissues underneath it. It is most commonly caused by Group A strep and typically enters the body through a break in the skin.

    Dependent on severity of infection

    Rarity:
    Uncommon
    Top Symptoms:
    fever, knee pain, knee redness, knee injury, painful knee swelling
    Symptoms that always occur with skin infection of the knee:
    knee redness, area of skin redness
    Urgency:
    Primary care doctor

    Knee Redness Checker

    Take a quiz to find out why you’re having knee redness.

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  4. 4.Insect Bite From a Chigger

    Chiggers are mites that feed on humans and animals only while they are larvae, or their infant form. People can contract chiggers when they contact infected grass. Chiggers feed for three to four days on a piece of skin, and secrete a fluid that causes intense itching.

    Once treated, the pain and inflammation should go away within days. Sometimes, itching may persist for several weeks due to what is called a delayed sensitivity reaction.

    Rarity:
    Rare
    Top Symptoms:
    lower leg itch, lower leg redness, knee itch, ankle itch, ankle redness
    Urgency:
    Phone call or in-person visit
  5. 5.Necrotizing Fasciitis of the Leg

    Necrotizing fasciitis is a potentially life threatening skin condition stemming from the infection of a wound or injury. If left untreated, it can spread to body parts surrounding the infection changing the color of the skin and degrading the tissue underneath. This can result in muscle, tissue or limb loss and a severe body-wide response to the infection.

    1-6 weeks.

    Rarity:
    Ultra rare
    Top Symptoms:
    nausea, diarrhea, vomiting, fever, chills
    Symptoms that always occur with necrotizing fasciitis of the leg:
    leg skin changes
    Urgency:
    Hospital emergency room
  6. 6.Lyme Disease

    Lyme Disease is a bacterial infection caused by the bite of a tick, which needs to latch on for a few days to transmit the bacteria. This infection can affect the skin, but more dangerously, the nervous system.

    If treated properly, people are typically cured but may have symptoms for a few months even without signs of an actual infection.

    Rarity:
    Ultra rare
    Top Symptoms:
    fatigue, headache, irritability, muscle aches, loss of appetite
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Knee Redness

  • Q.Do you have a rash?
  • Q.Is the red area flaky and rough to the touch?
  • Q.The redness affects one knee or both knees?
  • Q.Did your symptoms start after you were exposed to nickel (commonly found in jean snaps, metal pens, paper clips, cigarettes, etc.)?

If you've answered yes to one or more of these questions, try our knee redness symptom checker to find out more.

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Knee Redness Symptom Checker Statistics

  • People who have experienced knee redness have also experienced:

    • 9% Knee Pain
    • 8% Lower Leg Redness
    • 5% Upper Leg Redness
  • People who have experienced knee redness had symptoms persist for:

    • 48% Less Than a Day
    • 26% Over a Month
    • 20% Less Than a Week
  • People who have experienced knee redness were most often matched with:

    • 80% Skin Infection of the Knee
    • 20% Allergic Contact Dermatitis of the Knee
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

A.I. Health Assistant

Take a quiz to find out why you’re having knee redness

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