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An eruption cyst (or eruption hematoma) is a swelling over an erupting primary or permanent tooth. It contains fluid that sometimes collects around the erupting tooth. The fluid is often clear, creating a pale colored eruption cyst, but may contain some blood, in which case the cyst is technically called an eruption hematoma. These dark cysts seem to worry parents more, but if your child has one, do not be alarmed. The cyst disappears when the tooth erupts, and no treatment is needed.