Varicella – typically a vesicular rash
Measles – the prodromal symptoms are coryxa, conjunctivitis and high fever before the rash appears – usually starting on the head and neck
Parvovirus B19 causes “slapped cheek syndrome” with bright red rash seen on both cheeks
Adenoviruses can cause lots of different infections such a srespiratory infections, gastroenteritis or conjucntivits but there is no specific associated rash.
Scarlet fever cause a rough sandpaper rash that typically stars of the torso before spreading all over the body.
HSP causes a purpuric rash typicaly on the legs/buttocks it’s a vasculitis which typically often happens after an infection.