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You have to post a pic of close-up. Infected dandruff ulcer can give such scar.
Yes it is. Recent healed scar after infection will take time to get blanched meanwhile you may use blocking skin tone make-up cream to hide it.
Not right away if skin is not breached.
Please keep hair short, use only mild shampoo for bathing, hydrocortison combined with antifungal cream and avoid hair oil.