Child’s Fever, Tongue Blisters, and Hand, Foot, and Mouth Disease: Can Fingertip Blood Tests Confirm?

My child has been feverish for 4 days, with intermittent high fever, clear nasal discharge, and slight cough. The doctor diagnosed it as viral influenza. Upon returning home late at night, I noticed 4 blisters on my child’s tongue tip, which were only 2 blisters two days ago. Today, the doctor only examined the throat and not the tongue, and I forgot to ask. So I want to ask if blood tests at the fingertips can detect hand, foot, and mouth disease, and whether tongue blisters are a symptom of hand, foot, and mouth disease.
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Childhood White Matter Hypoplasia Sequelae

Sequelae of childhood white matter hypoplasia may include lack of appetite, poor mental state, weight loss, and oxygen deprivation issues caused by amniotic fluid rupture at birth. The severity of symptoms can affect disease progression and treatment outcomes. Mild symptoms may not be severe, while severe symptoms may pose a risk of mental retardation.
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