Thank you for your query,
The runny ear is due to ear infection
because of middle or outer ear infection and may need antibiotic treatment.
If your child had chickenpox
in the past, this present skin lesions could not be chickenpox, as there will will be no recurrence in chickenpox.
It may be a allergic papular rash
or due to a virus.
Nothing to worry, consult your Pediatrician
for the examination of the ears and skin lesions and thier proper management.
Hope I have answered your query.