A “Stork Bite” is NOT a sign of MTHFR

#Naturopathic Anticipatory Guidance and an organizational soluti

Social media is weird sometimes!

Dr. K here.   For the last several years I have seen this picture spread all over social media (Pinterest, Facebook and even IG).  The heading shows “this is a sign of MTHFR” and shows pictures of a “stork bite” in many different locations.  One version also shows a blue vein on the bridge of the nose and says this is also an indicator of MTHFR (this one calls it a Sugar Bug).

Sorry folks, this is straight up not true. 

What is a “Stork Bite?” 

It is called a nevus simplex and is present in 30-40% of all newborns, regardless of MTHFR status.  MTHFR polymorphism is VERY common (20-40% of all individuals have a MTHFR polymorphism), and Stork Bites are also VERY common, so it is definitely possible for kids to have both.  But having a Stork Bite does NOT mean that the child definitely has MTHFR!!!

Nevus Simplex or Stork Bite is a benign (“not dangerous”) capillary malformation.  It is typically found on the base of the neck (nape), the eyelid or glabella (between eyes).  It is caused by a delay in maturation of skin cells while the baby is still developing in the womb. These tiny blood vessels under the skin dilate, which is what causes the “stork bite.” 

Usually these little spots get red with crying, fever, straining and temperature changes. 

Isn’t a Stork Bite dangerous?

A Stork Bite isn’t dangerous unless it is located over the spine AND there are other signs of Spina Bifida (sacral dimple, or tuft of hair over the lower spine).  True Spina Bifida is associated with MTHFR. There are a few other genetic problems where it could be a sign of a problem too (like Beckwith-Wiedemann syndrome.)

Sometimes Stork Bites look like other newborn/infant skin lesions like nevus flammeus (Port Wine Stain) or hemangiomas – we’ll cover that in another post.  If you want to see the difference check out these pictures of a nevus flammeus and hemangioma from DermNetNZ.  Scroll past the pics of nevus simplex. (An awesome source for dermatology pics for providers.)  Port Wine stains and hemangiomas may be associated with other serious conditions when they occur on the face (like Sturge-Weber syndrome, or PHACE syndrome). 

When will it go away?

Stork bites will naturally fade over time.  Usually the face and eyelid marks are totally gone by age 2.  Sometimes the Stork Bites on the nape of the neck persist for a lifetime, but since they are typically covered by hair it usually isn’t much of an issue.

What about the “Sugar Bug?”

By the way, that blue vein across the nose or up the forehead is totally normal too.  Babies have really thin, delicate skin.  ALL of us have that vein, you can just see it better in infants because their skin is so delicate.  The nose vein is called the nasal root vein, and the one going up the forehead is called the supratrochlear vein.  Sometimes you can see that supratrochlear vein bulging in healthy adults.  It’s nothing to be worried about!

Dermatology pictures thanks to DermNet at which we cropped to fit. (Creative Commons with attribution license.)   Here at Naturopathic Pediatrics we do NOT take images without permission 🙂 

Erika Krumbeck, ND, FABNP
Erika Krumbeck

Dr. Erika Krumbeck is the proud founder and editor of, the leading internet source for trustworthy natural health information for children and naturopathic pediatric providers. She is also the owner of Montana Whole Health, a primary care naturopathic practice in Missoula, MT. She is one of few doctors with the FABNP designation, meaning she is a board-certified pediatric naturopathic physician. Dr. Krumbeck has specialized training in treating chronic conditions in children using safe, gentle and effective natural remedies. She helps bridge the gap between conventional medicine and complementary/alternative medicine by using both new research and traditional naturopathic therapies to guide treatment.


  • Avatar
    Brittany M
    April 23, 2023 at 6:50 am

    My daughter has the one strok bite above her butt and on her neck. Are there other signs I could look for to see if she has the MTHFR?

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    April 6, 2020 at 2:03 am

    When do sugar bugs go away?

      • Avatar
        April 6, 2020 at 4:06 pm

        I noticed the vein when he was 3 months old. I don’t remember seeing it before then. Do they usually show up months later?

        • Avatar
          April 6, 2020 at 4:17 pm

          One more question, first time mom so new to everything! 🙂 does the sugar bug mean adhd? I saw something online. Thanks!

  • Avatar
    November 24, 2019 at 4:21 pm

    I’ve seen this on social media as well and even became worried when it also mentioned a dimple in the butt crack as also being a sign. My baby has the sugar bug and this dimple. Any thoughts on it?

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