How can I tell if a red dot is petechiae or a cherry angioma at home?

Noticing small red dots on your skin that aren’t itchy can be unsettling. Two common possibilities are petechiae and cherry angiomas. Here’s how you can tell them apart at home—and when to get medical advice.

What are petechiae and cherry angiomas?

Petechiae

• Tiny red or purple spots (usually under 3 mm in diameter)
• Flat to the touch
• Caused by pinpoint bleeding under the skin (broken capillaries)
• Often appear in clusters

Cherry angiomas

• Bright red to purple bumps (from 1 mm up to 5 mm or more)
• Slightly raised, dome-shaped
• Made up of small blood vessels that have grown into a benign tumor
• Common on the trunk, arms, and shoulders—especially after age 30

Both are usually not itchy, but their causes and implications differ.

Key differences to look for

1. Size

   • Petechiae: under 3 mm
   • Cherry angiomas: usually 1–5 mm or larger

2. Shape and texture

   • Petechiae: flat, like a tiny freckle or pinpoint bruise
   • Cherry angiomas: raised, round, dome-shaped

3. Color intensity

   • Petechiae: red to purplish, often darker
   • Cherry angiomas: bright cherry-red, though they can turn blue-purple

4. Number and distribution

   • Petechiae: may appear in patches on legs, arms, or torso—sometimes from physical strain (sneezing, coughing)
   • Cherry angiomas: scattered more randomly, especially on the trunk

5. Blanch test

   • Press firmly with the tip of a clean glass or your finger for 10 seconds
   • Petechiae won’t disappear under pressure (non-blanching)
   • Cherry angiomas will blanch (turn pale) and refill once you release

How to check at home

1. Inspect the spots in good light

   • Use a mirror or ask someone to help if they’re on your back.
   • Note size, color, and shape.

2. Perform the blanch test

   • Press a clear glass or your fingertip firmly on a spot for about 10 seconds.
   • Watch closely: does the red color fade (blanch) or stay?

3. Feel the spot

   • Run a clean fingertip gently over it.
   • Is it raised (angioma) or flat (petechiae)?

4. Keep a simple log

   • Date you first noticed the spots
   • Any changes in size, number, or color
   • Any new symptoms (fever, bruising, fatigue)

When to get worried

Most cherry angiomas are harmless and don’t require treatment. Petechiae can also be harmless if linked to minor pressure or injury. But sometimes they point to a more serious condition.

Seek medical help if you notice:

• Sudden, widespread petechiae (especially on your chest or back)
• Easy bruising or bleeding gums
• Unexplained fevers, chills, or persistent fatigue
• Signs of infection near the spots (red streaks, warmth, swelling)
• Spots that grow rapidly, bleed without injury, or change color dramatically

If you’re unsure about your symptoms, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker.

Other things to consider

• Medications: Blood thinners and steroids can make you more prone to both angiomas and petechiae.
• Medical history: Platelet disorders, liver disease, or infections can cause petechiae.
• Family history: Cherry angiomas often run in families.

Next steps

1. Monitor your skin for any changes every few days.
2. Avoid vigorous pressure or rubbing on the area.
3. Use gentle skincare products—harsh chemicals can irritate sensitive skin.
4. Stay hydrated and maintain a balanced diet rich in vitamin C and bioflavonoids (found in citrus fruits), which help capillary health.

Always remember: if you have any concerns about spots that could be life-threatening or serious, speak to a doctor right away. A professional evaluation is the only way to be sure you’re safe and to rule out any underlying condition.