Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
Your 16 month old kid has been diagnosed with
tonsilitis , and prescribed penicillin, and
nurofen. next day his temperature is rising
rigors, teeth chattering, lips, hands and feet turned bluish.
The reasons might be , due to
high fever there might be
tachycardia, and less oxigenation to the tissues,
There might be pre existing heart problem and appearent due to high fever.
Or the
throat infection can lead to heart problem like valve stenosis or regurgitation.
What ever the reason is you should immediately rush to the pediatric specialist for diagnosis and treatment.
Wishing him a quick and complete recovery.
Best regards.