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In young children look for mottled or bluish skin, lethargy or hard to wake, extreme cold, breathing too fast, a rash that stays when pressed, or convulsing.
People who are extremely ill with symptoms such as trouble breathing, bluish skin color, fever with a rash, dizziness or severe or persistent vomiting should seek out immediate medical help.
This netizen poked fun at Thanos' bluish skin seen in earlier films, comparing it with his more 'tanned' complexion in the trailer.