When someone spills formaldehyde solution on the skin and a day or so later starts noticing a red area despite having washed most of it off, what likely is happening?

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The Answer of When someone spills formaldehyde solution on the skin and a day or so later starts noticing a red area despite having washed most of it off, what likely is happening?

When Someone Spills Formaldehyde Solution on the Skin and a Day