Read below about dark red/purple mouth sore, including causes and common questions. Or get a personalized analysis of your dark red/purple mouth sore 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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3 Potential Dark Red / Purple Mouth Sore Causes

Disclaimer: The article does not replace an evaluation by a physician. Information on this page is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.

  1. 1.Hand - Foot - and - Mouth Disease

    Hand-foot-and-mouth disease is a mild, contagious viral infection common in young children. It is characterized by sores in the mouth and a rash on the hands and feet.

    7-10 days

    Rarity:
    Rare
    Top Symptoms:
    loss of appetite, cough, fever, new headache, sore throat
    Symptoms that always occur with hand-foot-and-mouth disease:
    spontaneous skin changes
    Urgency:
    Self-treatment

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  2. 2.Cold Sore

    Cold sores (also called oral herpes or fever blisters), are viral infections of the mouth caused by the herpes virus type 1. You were probably infected very early in life as a child when an adult kissed you. The virus stays asleep (dormant) and causes infections every now and then after exposure to lots of sun or emotional/physical stress. It is contagious when an outbreak is happening, but treatment is limited unless you are immunocompromised.

    1-2 weeks. Natural healing process starts within 24 hours of the initial sore starting.

    Rarity:
    Uncommon
    Top Symptoms:
    mouth lesions, itchy mouth, pain on the outside of the lips, lip numbness, burning pain on the outside of the lips
    Symptoms that always occur with cold sore:
    mouth lesions
    Urgency:
    Self-treatment
  3. 3.Mononucleosis Infection

    EBV Mononucleosis is a clinical syndrome characterized by fever, sore throat, and swollen lymph nodes.

    2-3 weeks

    Rarity:
    Common
    Top Symptoms:
    fatigue, headache, loss of appetite, abdominal pain (stomach ache), cough
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Dark Red / Purple Mouth Sore

  • Q.Do you have a rash?
  • Q.Any fever today or during the last week?
  • Q.Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?
  • Q.Have you lost your appetite recently?

If you've answered yes to one or more of these questions, try our dark red/purple mouth sore symptom checker to find out more.

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Dark Red / Purple Mouth Sore Symptom Checker Statistics

  • People who have experienced dark red/purple mouth sore have also experienced:

    • 15% Mouth Lesions
    • 3% Neck Bump
    • 3% Gum Swelling
  • People who have experienced dark red/purple mouth sore had symptoms persist for:

    • 46% Less Than a Week
    • 27% Less Than a Day
    • 10% Over a Month
  • People who have experienced dark red/purple mouth sore were most often matched with:

    • 64% Cold Sore
    • 12% Hand - Foot - and - Mouth Disease
    • 4% Mononucleosis Infection
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

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