A strawberry birthmark forms when blood vessels grow and cluster faster than normal. This creates a raised red patch during a baby’s first weeks of life. Doctors call this an infantile hemangioma, and it ranks among the most common vascular growths seen in newborns. Several factors raise the odds that a baby will develop one, including pregnancy complications, maternal health conditions, and genetics. Most of these marks are harmless and fade with time, but understanding the cause helps parents know what to expect. This guide covers five risk factor categories linked to these lesions. It also explains how they differ from other birthmarks and when treatment might help.
Key Takeaways
- Infantile hemangiomas are benign growths caused by abnormal blood vessel proliferation, not structural defects like port wine stains.
- Five categories of risk factors, spanning maternal health, hormones, perinatal complications, genetics, and clinical presentation, raise the odds of developing one.
- Preterm birth, placenta previa, gestational diabetes, and anemia in pregnancy are among the most consistently linked risk factors.
- Treatment ranges from oral beta blockers to laser therapy and surgical removal, depending on the lesion’s size and location.
- A hemangioma in a beard distribution pattern or covering a large facial area may need urgent evaluation.
What are infantile hemangiomas and how do they differ from other vascular birthmarks?
Infantile hemangiomas are benign vascular tumors that appear within the first few weeks of life. They grow quickly over several months, then slow down and often fade without intervention. Unlike some other vascular marks, they are usually not visible at birth.
How do capillary hemangiomas form?
Capillary hemangiomas form through endothelial cell proliferation. According to StatPearls, endothelial cell proliferation results in hemangiomas, meaning cells lining small blood vessel walls divide faster than they should.
Two molecular signals drive this process. The vascular endothelial growth factor receptor signals vessels to grow, while hypoxia-inducible factor-1α responds to low oxygen. When these signals misfire, they lead to abnormal capillary growth.
Capillary infantile hemangiomas are the most common subtype. They sit in the upper skin layers and create the raised, bright red surface parents typically notice first.
Not every red mark works the same way. A vascular malformation, like a port wine stain, forms during fetal development. It is a structural problem, not a growth problem.
Port wine stains are flat, present at birth, and do not fade. A cherry angioma is a different benign growth that appears in adults, not newborns.
These lesions follow a three-phase cycle: rapid growth, a plateau, then gradual fading. A lesion that looks alarming at four months may look very different by age five. This is why clinicians often recommend monitoring first.
5 Risk Factors Linked to Strawberry Hemangiomas: Maternal and Perinatal Factors
These lesions do not develop randomly. Researchers have identified five categories of risk factors that appear repeatedly across studies. A case-control study in PMC found several maternal and perinatal factors were associated with IH occurrence, helping explain why some infants are more affected than others.
- Maternal health conditions during pregnancy
Maternal factors that raise risk include anemia in pregnancy, a prior miscarriage, and threatened miscarriage during the current pregnancy. Each condition can affect how well the placenta delivers oxygen to the fetus. Gestational diabetes and elevated blood sugar also raise risk.
- Hormonal and medication factors
Progesterone use during pregnancy has appeared in research as a contributing factor. Hormonal shifts during gestation may affect the pathways that control blood vessel growth in the developing fetus.
- Perinatal complications
Preterm birth is one of the strongest perinatal risk factors. Premature infants develop these marks more often than full-term newborns. Placenta previa, preterm premature rupture of membranes, and abnormal amniotic fluid volume also raise risk.
- Genetic factors and family history
A family history of these growths raises the probability that a child will develop one. Researchers have not confirmed a single gene as the cause. Still, the marks cluster in families, pointing to a heritable component.
- Clinical features during the proliferative stage
During the proliferative stage, the lesion grows fast, and its clinical features become easier to assess. Some children develop marks as part of a broader syndrome, so size, number, and location all matter during evaluation. Ultrasound imaging can clarify how deep a lesion goes when the surface appearance does not tell the full story.
Maternal smoking and alcohol consumption have appeared in some studies as possible contributing factors. The evidence here is less consistent than for the perinatal factors above.
Treatment Options for Strawberry Birthmarks: Beta Blockers, Laser Therapy, and Surgical Removal
Not every hemangioma needs treatment, and many involute without leaving significant marks. When a lesion does need attention, options fall into three categories: medication, laser therapy, and surgery. The right path depends on the lesion’s size, depth, location, and the problems it causes.
Oral and topical medications
Oral beta blockers are the standard treatment for hemangiomas needing systemic care. StatPearls notes they are effective as first-line therapy. They slow abnormal blood vessel growth and speed up fading. Doctors often use topical beta-blocker formulations for smaller, surface-level lesions. A pediatric dermatologist or pediatrician typically manages medication.
Laser therapy
Laser treatments for vascular lesions, including birthmarks, are available. An evaluation can determine whether this approach fits a child’s specific case. Laser treatment targets discoloration and vascular activity left behind after a lesion begins to fade.
A pulsed dye laser targets the vessels causing the red color while leaving surrounding skin intact. For lesions with both surface and deeper components, a dual-wavelength laser can reach both layers in one session.
Surgical intervention
Doctors consider surgical removal when a lesion leaves fibrous tissue after fading. Surgery also helps when a lesion creates a functional problem or sits where other treatments cannot reach it. Surgical evaluation for vascular lesions is available, and the decision depends on the lesion’s characteristics and the child’s situation.
When to seek urgent referral
Some hemangiomas need prompt evaluation rather than a scheduled visit. A lesion in a beard distribution pattern, covering the jaw, chin, and neck, raises concern for airway involvement.
Marks covering a large facial or body area may signal internal involvement affecting the liver or cardiovascular structures. Magnetic resonance imaging often checks for this. A pediatric hematologist or oncologist may join the care team when findings suggest a syndrome.
Should you worry about that strawberry birthmark on your baby?
Specific biological processes lead to the formation of a strawberry birthmark, and the risk factors span maternal health, pregnancy complications, and genetics. Most lesions follow a predictable course and fade without treatment. Some benefit from beta blockers, laser therapy, or surgical removal.
If your child has a lesion you are unsure about, our team can help you understand what you’re seeing and what comes next. Schedule a hemangioma evaluation with our team to get clear answers and a plan tailored to your child.
FAQs
What is hemangioma?
A hemangioma is a benign vascular growth made of blood vessels that cluster and multiply faster than normal. In infants, it usually appears as a raised, bright red patch within the first few weeks of life. It is not cancerous and often shrinks on its own over several years.
When to worry about a strawberry birthmark?
Seek evaluation if the mark sits near the eye, nose, mouth, or airway, or covers a large area of the face or body. A beard distribution pattern along the jaw and neck also warrants prompt attention. Rapid growth, persistent bleeding, or open sores are additional signs to have checked sooner rather than later.
Do hemangiomas go away?
Yes, many involute without treatment. Most start to fade after the first year. A large portion resolve substantially by age five. As StatPearls explains, 50% of hemangiomas will resolve in 5 years. Some leave behind mild discoloration or loose skin that may benefit from treatment once fading is complete.
Are hemangiomas hereditary?
Family history plays a role, and children with a relative who had one face higher odds of developing one themselves. No single gene has been confirmed as the cause. Researchers believe inheritance patterns involve multiple factors affecting blood vessel growth, rather than one clear genetic marker parents can test for in advance.
Why do babies get hemangiomas?
Hemangiomas form when blood vessel cells divide faster than they should, a process linked to low-oxygen signals during development. Certain pregnancy factors raise the odds, including preterm birth, placenta previa, gestational diabetes, and maternal anemia. Genetics and hormonal changes during pregnancy also contribute to why some infants develop these growths, and others do not.
