Illinois Department of Public Health
back to poster

IDPH home
  Chickenpox Stages of Rash  
Notify your local health department or the Illinois Department of Public Health immediately of a suspected or confirmed case of smallpox. Report a suspected or confirmed case of adult (20 years or older) chickenpox within 24 hours and suspected or confirmed cases of chickenpox in a child (up to 19 years of age) within seven days to the local health department.
  • Incubation period is between 14 and 21 days after contact with a chickenpox case.

  • No illness precedes the chickenpox rash.

  • The pocks are most numerous on the trunk.

  • Pocks are seldom present on the palms and soles.

  • The rash usually occurs in multiple crops of lesions, various stages of development can be observed simultaneously on any part of the body.

  • Scabs that are not infectious begin to form four to seven days after the rash appears.

  • Scabs fall off within 14 days after the rash begins.

  • Pocks are more superficial.

  • Vesicles collapse on puncture.
  Chickenpox Rash