Is this a sign of allergy ?

Did you get an answer? Looks like petechia to me, burst blood vessels from coughing or throwing up.

Could also be hand, foot, mouth. But that appears after a high fever.

Does she have a fever? Spots any where else like in her mouth? Not to jump to conclusions, but measles will often start at the top of the body and can cause eyes to swell. We’ve had measles outbreak where we live.