Are Repeated Fever Symptoms a Sign of Hand, Foot, and Mouth Disease?

The child has been feverish for four days, with a fever every four hours on average, accompanied by a runny nose and slight cough (up to two or three times a day). After a hospital urine test, the doctor diagnosed it as a viral cold. However, upon returning home, the child was found to have four small blisters on the tip of the tongue, two fewer than before. The doctor only checked the throat during the visit and did not examine the tongue, and I also forgot about this situation. Therefore, I would like to ask whether a peripheral blood test can diagnose hand, foot, and mouth disease? Are blisters on the tip of the tongue a symptom of hand, foot, and mouth disease?
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