A cystic hygroma is also known as a lymphangioma. It is a painless, benign cyst that looks like a fluid-filled sac.
It can develop on your baby during pregnancy and is detectable by an ultrasound. In some cases, it may not show up until after your baby is born. At that point, it will be a noticeable bump or bulge under their skin.
While most cystic hygromas are located on the neck or under the arm, they can be found anywhere on the body. Prompt treatment is crucial. If left untreated, a cystic hygroma can grow over time. Characteristics that you might notice about the cyst include:
- A blue tint in the skin on top
- Soft texture
- Size ranging from a grape to a grapefruit
If the hygroma appears during pregnancy, it could create an excess amount of fluid in the fetus’ body, which can increase the risk of miscarriage or stillbirth. Prompt treatment can decrease the size of the cyst or eliminate it altogether.