A newborn's first checkup often comes with a skin surprise — a bluish patch, a red mark, a few little dots that weren't there the day before. The vast majority of birthmarks are completely harmless, but knowing about them ahead of time helps keep the worry in check.
Mongolian spot
A bluish or grayish patch with soft, undefined edges, typically found on the lower back or buttocks. Very common in babies with darker skin tones, and present from birth. It doesn't hurt, isn't a sign of any injury (even though at a glance it can look like a bruise), and needs no treatment — it fades over the years and in many cases disappears completely before age 5-6. It's worth having it noted in the baby's medical chart, specifically to avoid it being confused with a bruise later on.
Hemangioma
A red, slightly raised mark, sometimes described as a "strawberry mark." Unlike a Mongolian spot, it isn't always present at birth — it can show up in the first weeks of life. It grows fairly fast in the first months, then plateaus and starts shrinking gradually. Most need no treatment and fade away over the years. It's worth checking in if it grows very fast, bleeds, or sits near the eyes, nose, or mouth, where it could interfere with a function.
Erythema toxicum
Despite the alarming name, it's one of the most common and most harmless rashes a newborn can have — small red spots with a white or yellow dot in the center, scattered across the body. It usually shows up between day 1 and day 4 of life, doesn't itch or bother the baby, and clears up on its own within 1 to 2 weeks without leaving a mark.
When to call the pediatrician
- The mark grows very fast or changes shape noticeably.
- It bleeds or looks like an open wound.
- A hemangioma is located near the eyes, nose, or mouth.
- The area looks infected (pus, a lot of redness around it).
- You're unsure whether a mark is truly harmless — better to ask than assume.
Checkup log — a real screen from the Alfonso app.
Log it from the very first checkup
Create your baby's profile in 30 seconds, no account or password needed, and note pediatrician checkups — to have the date and details of every mark on hand if you ever need to ask about it. Syncs automatically with your partner.
Frequently asked questions
Is a Mongolian spot a bruise?
No — it's a harmless bluish or grayish mark, typically on the lower back or buttocks. Not a sign of injury.
Does a hemangioma go away on its own?
Most do — grows a bit at first, then shrinks, often gone before age 5-10.
What is erythema toxicum?
Small red spots with a white center, very common in the first days. Harmless, clears up on its own in 1-2 weeks.
Keep reading
ℹ️ This article is informational and doesn't replace a pediatrician's judgment. If you're unsure about a mark on your baby's skin, always check with a healthcare professional.