Most red blood looking spots on skin fall into two camps: harmless overgrowths of tiny blood vessels called cherry angiomas, or true bleeding under the skin called petechiae and purpura. The fastest way to tell them apart at home is the blanch test — press a clear drinking glass firmly against the spot. If it fades or disappears under pressure, you’re almost certainly dealing with something benign. If it stays stubbornly red or purple, blood has leaked out of the vessels into the skin, and that deserves a medical opinion.
The urgency depends on company the spots keep. A handful of pinpoint red dots on the shins of an otherwise well adult who just finished a hard workout is rarely alarming. The same dots appearing rapidly alongside fever, confusion, bleeding gums, or nosebleeds is a medical emergency until proven otherwise. Below is how clinicians sort this out, what tests to ask for, and where the real danger lines sit.
Quick Comparison: What Red Spots on Skin Actually Are
| Type | Size & Appearance | Blanches? | Typical Cause | Concern Level |
|---|---|---|---|---|
| Cherry angioma | 1–5 mm, bright red, slightly raised, dome-shaped | Partially or no | Benign vessel proliferation; increases with age after 30 | Low — cosmetic only |
| Petechiae | Under 2 mm, flat, pinpoint, red to purple | No | Low platelets, straining, infection, vasculitis | Moderate to high |
| Purpura | 2 mm–1 cm, flat or palpable patches | No | Vasculitis, clotting defects, drugs, fragile vessels | High if new or palpable |
| Ecchymosis (bruise) | Over 1 cm, changes color over days | No | Trauma, anticoagulants, liver disease | Depends on context |
| Telangiectasia | Thin red threads or spider shapes | Yes | Sun damage, rosacea, liver disease, pregnancy | Low to moderate |
| Insect bite / folliculitis | Red, often itchy, sometimes a central punctum | Yes | Bites, irritation, bacterial follicle infection | Low |
Cherry Angiomas: The Most Common Culprit
If you’re an adult over 40 noticing bright red, slightly raised dots on your trunk that have accumulated slowly over years, you are almost certainly looking at cherry angiomas — also called Campbell de Morgan spots. They’re clusters of dilated capillaries, and they’re one of the most common benign skin lesions in adults.
They don’t turn into cancer, they don’t signal internal disease, and they don’t need treatment. If one bleeds after being nicked by a razor or a zipper, that’s normal for a vessel lesion. Removal by electrocautery, shave excision, or pulsed dye laser is straightforward if a spot catches on clothing or bothers you cosmetically.
Red flag exception: a sudden shower of dozens of new angioma-like lesions over weeks, especially with weight loss or systemic symptoms, warrants an evaluation rather than reassurance.
When Red Spots Mean Bleeding Under the Skin
Non-blanching spots mean red cells have escaped the vasculature. Three mechanisms drive this: too few platelets, platelets that don’t work, or blood vessels that leak.
1. Low platelet count (thrombocytopenia)
Platelets plug the microscopic gaps in capillaries that occur constantly. When they run short, blood seeps out and you see petechiae — classically on the lower legs and feet, where hydrostatic pressure is highest.
| Platelet Count (per µL) | Clinical Significance |
|---|---|
| 150,000–450,000 | Normal reference range |
| 100,000–150,000 | Mild — usually no bleeding; needs monitoring |
| 50,000–100,000 | Moderate — bleeding with trauma or surgery |
| 20,000–50,000 | Easy bruising, petechiae often appear |
| Below 20,000 | Spontaneous petechiae and mucosal bleeding likely |
| Below 10,000 | Risk of serious spontaneous hemorrhage — urgent |
Common causes include immune thrombocytopenia (ITP), viral infections such as dengue, EBV and CMV, alcohol use, chemotherapy, and drug reactions — heparin, quinine, sulfa antibiotics, and vancomycin are repeat offenders. A full platelet count workup is the single most useful first step.
2. Clotting factor problems
Coagulation defects tend to produce larger bruises and deep bleeds rather than pinpoint petechiae. Vitamin K deficiency, warfarin, liver disease, and inherited blood clotting disorders such as hemophilia or von Willebrand disease belong here. Prolonged PT/INR or aPTT on lab testing points this direction.
3. Vessel wall and vasculitis causes
Palpable purpura — purple spots you can feel as raised bumps — is the hallmark of small-vessel vasculitis and always merits prompt evaluation. In children, IgA vasculitis (Henoch-Schönlein purpura) typically produces symmetric purpura on the buttocks and legs with abdominal pain or joint swelling.
Other vessel-related causes:
- Senile (actinic) purpura — flat purple patches on sun-damaged forearms and hands in older adults; benign, from fragile dermal collagen
- Steroid purpura — same mechanism, driven by long-term oral or potent topical corticosteroids
- Scurvy — vitamin C deficiency causes perifollicular petechiae with corkscrew hairs; still seen in people with very restricted diets or alcohol use disorder
- Mechanical petechiae — above the nipple line after violent coughing, vomiting, weightlifting, or childbirth; harmless and self-limited
The Emergencies You Cannot Miss
Meningococcemia. A non-blanching petechial or purpuric rash plus fever, headache, neck stiffness, or lethargy is a call-an-ambulance situation. The rash can progress from a few spots to widespread purpura within hours.
Thrombotic thrombocytopenic purpura (TTP). Petechiae with fever, confusion, pallor, and reduced urine output. Untreated mortality is very high; plasma exchange is time-critical.
Acute leukemia. Petechiae plus fatigue, recurrent infections, bone pain, or swollen lymph nodes in a patient with pancytopenia.
Disseminated intravascular coagulation (DIC). Purpura with oozing from IV sites in a critically ill or septic patient.
When to See a Doctor
Go to the emergency department now if:
- Non-blanching spots with fever, especially if spreading quickly
- Confusion, severe headache, neck stiffness, or difficulty waking
- Bleeding gums, heavy nosebleeds, blood in urine or stool, or unusually heavy periods
- New purpura while on warfarin, DOACs, or heparin
- Spots in a child who looks unwell or lethargic
Book an appointment within a week if:
- Petechiae appear without an obvious trigger and don’t fade in 3–5 days
- You bruise far more easily than you used to
- Spots are raised and purple (palpable purpura)
- You started a new medication in the past 4–8 weeks
Tests Worth Asking For
- Complete blood count with differential — platelets, hemoglobin, white cells
- Peripheral blood smear — catches platelet clumping, schistocytes, and blast cells
- PT/INR and aPTT — screens the clotting cascade
- Comprehensive metabolic panel — liver and kidney function
- Targeted extras — ANA, ANCA, hepatitis B/C, HIV, or skin biopsy when vasculitis is suspected
Frequently Asked Questions
Do petechiae go away on their own?
Mechanical petechiae from coughing or straining typically fade within 3–7 days as the red cells are reabsorbed. Petechiae caused by low platelets or vasculitis persist or keep reappearing in new crops until the underlying problem is treated.
Can stress or anxiety cause red blood looking spots?
Not directly. Stress-related vomiting, coughing fits, or intense straining can raise venous pressure enough to rupture facial capillaries, producing petechiae above the neck. Psychological stress alone does not lower platelets or damage vessels.
Why do I keep getting new cherry angiomas?
Their number rises steadily with age, and genetics plays a large role — they cluster in families. Pregnancy and some chemical exposures have been associated with them. Gradual accumulation over years is expected and benign.
Are red spots on the legs always serious?
No. Gravity makes the lower legs the first place any bleeding tendency shows, but the shins are also the most common site for minor trauma, folliculitis, and stasis-related changes. The blanch test plus a CBC sorts out most cases quickly.
Can I remove cherry angiomas at home?
Don’t. They’re vascular lesions and can bleed significantly. Home cauterization also scars and can obscure a lesion that needed a proper diagnosis. In-office laser or electrocautery takes minutes.
Key Takeaways
- Press a glass against the spot — blanching favors benign, non-blanching means bleeding into the skin
- Cherry angiomas are the most common benign cause in adults and need no treatment
- Spontaneous petechiae usually appear when platelets fall below roughly 20,000/µL
- Non-blanching rash plus fever is an emergency until meningococcal disease is excluded
- A CBC with peripheral smear and coagulation studies answers most questions on the first visit
