You notice them while dressing: tiny red dots on your arms, chest, or legs. Are they harmless? A sign of aging? Or something that needs a doctor’s attention? Let’s cut through the confusion with clear, medical-grade guidance—so you know when to act and when to breathe easy.
🔍 The "Glass Test": Your First Diagnostic Tool
- How to do it: Press a clear glass firmly against the spot.
- If it fades/disappears: Likely benign (e.g., cherry angioma, heat rash).
- If it doesn’t fade: Could indicate bleeding under the skin (petechiae/purpura)—seek medical evaluation.
💡 Key insight: Non-blanching red dots = blood vessel leakage—never ignore these.
🚨 Causes That Need Medical Attention (Don’t Wait)
1. Petechiae
- What: Pinpoint red/purple dots from capillary bleeding (don’t fade with pressure).
- Causes: Low platelets, infections (meningitis), blood disorders, or medication side effects.
- Action: Seek care immediately if accompanied by fever, bruising, or fatigue.
2. Viral Rashes (e.g., Measles, Chickenpox, Hand-Foot-Mouth)
- Clues: Fever + red spots that may blister or spread rapidly.
- Action: Isolate and contact a doctor—many are contagious.
3. Leukocytoclastic Vasculitis
- What: Inflamed blood vessels causing non-blanching red dots, often on legs.
- Triggers: Autoimmune disorders, infections, or drugs.
- Action: Requires dermatologist evaluation.
4. Scabies
- What: Itchy red bumps in lines (burrows), worse at night.
- Action: Prescription cream needed—highly contagious.
⚠️ Common but Benign Causes (Usually Harmless)
5. Cherry Angiomas:
