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THE LUMI BLOG

Eruption Cysts in Babies and Children in Sydney: That Blue Bump Over a New Tooth

A soft blue or clear bump over a tooth that is coming through can look alarming, but an eruption cyst is almost always harmless and clears on its own. Here is what it is and when to have it checked.

Dr James Tran, dentist at Lumi Dental Melrose Park

Dr James Tran

June 27, 2026 · Children's Dentistry · 8 min read

A soft, bluish or clear bump on a baby's gum right where a tooth is coming through is most often an eruption cyst, a small fluid-filled swelling that almost always clears up on its own. When the fluid is blood-tinged it looks darker and is called an eruption haematoma, but it is treated the same way. We have brought everything on this topic together in one complete, up to date guide.

Read the full guide: Eruption Cysts and Eruption Haematomas in Babies, which covers why they form, why treatment is rarely needed, and the signs worth having checked.

For more on this topic, read Delayed Tooth Eruption in Children and When a Child's First Adult Molar Comes in Crooked.

If you have questions about your baby's gums or teeth, the team at Lumi Dental is here to help. Visit our general dentist page or see current deals for a free consult and written quote.

Dr James Tran — Lumi Dental, Melrose Park

Written by Dr James Tran

Dr James Tran (BDS, University of Sydney) leads the clinical team at Lumi Dental in Melrose Park, working alongside Dr Audrey Yee, Dr Minh Thu Cao Xuan and Dr Anita To. The team is committed to clear, evidence-based dental information to help you make informed decisions about your care.

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