
Chickenpox and measles are both viral rashes, but differ in rash type (blisters vs. flat spots), initial symptoms (chickenpox often starts mild/tiredness, measles with high fever/cough/runny nose/red eyes), spread (chickenpox all over, measles from face down), and severity (measles generally more dangerous). Key differences: Chickenpox has itchy, fluid-filled blisters in different stages; measles has flat, red, blotchy patches, starts on the face, and includes respiratory symptoms like cough/conjunctivitis, with potential for serious complications like pneumonia or encephalitis.