Girls, my son has developed a round patch on the crown of his head with no hair, and I can only see…

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Girls, my son has developed a round patch on the crown of his head with no hair, and I can only see black roots under the skin. What could it be? We've scheduled a pediatrician appointment for tomorrow, they might have some insights, and if not, we'll see a dermatologist later. We noticed it a few days ago when we cut his hair; it wasn't visible under the longer strands. The skin in that spot isn't red or flaky.
Could it be an allergy to something? As soon as we put our son down to sleep, he sneezes constantly,…
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Asya
There's a photo. We had ringworm)))
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