Pediatrics

Common Birthmarks

OVERVIEW: What every practitioner needs to know

Are you sure your patient has a birthmark? What are the typical findings for this disease?

Common "birthmarks" are congenital skin lesions composed of structures normally present in the skin, but that aggregate focally in too great an amount or are absent. These include the following :

Café au lait macule

Congenital melanocytic nevus

Mongolian spot

Ash leaf macule

Capillary malformation

Nevus sebaceus

Other common congenital skin lesions result as a local embryologic defect in cutaneous development. These include the following:

Cutis aplasia

Dermoid cyst

Accessory tragus

Thyroglossal duct cyst

Birthmarks are usually discrete and solitary but can present as multiple lesions. In the vast majority of cases, birthmarks are present on the first newborn examination. More rarely, they are noted in the first weeks of life. They are usually easily diagnosed by the characteristic clinical examination:

A café au lait macule is characterized by a discrete, well-demarcated light brown (or "coffee with cream" colored) macule or patch (Figure 1). There is no overlying epidermal change. The color is homogeneous. They vary in size from several millimeters to greater than 3 cm. There is no associated induration of the underlying subcutaneous tissue.

Figure 1.

Cafe au lait macule.

Congenital melanocytic nevi present at birth as solitary, discrete dark brown papules or plaques (Figure 2 and Figure 3). The surface may be slightly raised, velvety, or verrucous, and dark long hair may be noted within the lesion.

Figure 2.

Congenital melanocytic nevus.

Figure 3.

Congenital melanocytic nevus.

A Mongolian spot is a blue to slate gray, ill-defined macule or patch, most commonly noted on the back, sacrum, or buttocks. Smaller lesions can occur on the extremities. They are particularly common in dark-skinned patients, and those of Asian ancestry (Figure 4). Nevus of Ito and nevus of Ota (Figure 5) are similar blue gray patches on the trunk and face, respectively.

Figure 4.

Mongolian spot.

Figure 5.

Nevus of Ota.

An ash leaf macule is a well-demarcated hypopigmented macule or patch (Figure 6). It may be very obvious on dark skin but may require examination with a Wood light to confirm its presence on very light skin. Nevus depigmentosa is likely a variant of an ash leaf macule and presents as a larger solitary hypopigmented patch (Figure 7). (Despite the name "depigmentosa," nevus depigmentosa is actually hypopigmented.)

Figure 6.

Ash leaf macule

Figure 7.

Nevus depigmentosa.

Capillary malformations (so-called salmon patch, angel kiss, or stork bite) usually present on the glabella, upper eyelids, or posterior neck (Figure 8). They are characterized by flat, poorly demarcated pink to red patches and may become darker or more noticeable when the child cries or is hot.

Figure 8.

Facial capillary malformations.

Nevus sebaceus is a yellowish pink, well-demarcated, slightly raised oval plaque, most commonly seen on the scalp (Figure 9 and Figure 10). There is associated alopecia. Close inspection may reveal a slightly "bumpy" surface.

Figure 9.

Nevus sebaceus.

Figure 10.

Nevus sebaceus.

Cutis aplasia is a localized congenital absence of skin. It presents most commonly on the scalp (Figure 11) but can occur anywhere on the body. It is characterized clinically by a midline scalp scar or defect present at birth. There may be an associated ulcer or erosion or a translucent film or membrane at the affected site. The defect can vary in thickness, and may involve epidermis, dermis, subcutaneous tissue, and underlying bone. The area heals with fibrosis and alopecia (Figure 12).

Figure 11.

Cutis aplasia in a newborn.

Figure 12.

Healed cutis aplasia.

Dermoid cysts present as firm, round to oval, skin-colored dermal nodules (Figure 13). The overlying skin is normal and mobile. A small sinus, punctum, or protrusion of hair may be seen in the center. They are most common on the lateral brow or orbital rim but can present anywhere on the face, scalp, neck, or midline trunk. They may be noted at birth, or later in infancy or childhood when they become traumatized or infected.

Figure 13.

Dermoid cyst.

An accessory tragus can occur at any site along the first branchial arch's embryologic migration pathway (in a line drawn from the ear tragus to the oral commisure). It presents on the preauricular face as an exophytic flesh-colored papule (Figure 14). It may be soft and compressible or firm, depending on the amount of cartilage present within the lesion. Multiple lesions are common.

Figure 14.

Accessory tragi.

A thyroglossal duct cyst presents as a small flesh-colored to red papule on the midline of the neck or as swelling of the anterior neck (Figure 15). When located over the hyoid, it is displaced superiorly with swallowing or tongue protrusion.

Figure 15.

Thyroglossal duct cyst.

What other disease/condition shares some of these symptoms?

The differential diagnoses includes the following:

Café au lait macule: congenital melanocytic nevus, postinflammatory hyperpigmentation, nevoid hypermelanosis, chimeric hyperpigmentation, lentigenes

Congenital melanocytic nevus: café au lait macule, melanoma, foreign body, epidermal nevus

Mongolian spot: bruise/trauma

Ash leaf macule: nevus anemicus, vitiligo, pityriasis alba

Capillary malformation: port wine stain, hemangioma, trauma

Nevus sebaceus: epidermal nevus, verruca, cutis aplasia

Cutis aplasia: trauma (scalp electrode), herpes infection, bacterial infection, nevus sebaceus

Dermoid cyst: encephalocele, nasal glioma, foreign body, epidermoid cyst

Accessory tragus: acrochordon, molluscum contagiosum

Thyroglossal duct cyst: bronchogenic cyst, branchial cleft cyst/sinus, lymphadenopathy, dermal nevus

What caused this disease to develop at this time?

Café au lait macules result from a local increase of melanin within the basal epidermis. There is no proliferation of melanocytes. Multiple café au lait macules can be associated with neurofibromatosis, and a large, unilateral, solitary café au lait macule is suggestive of McCune-Albright syndrome.

Congenital melanocytic nevi result from a proliferation of cytologically bland nevomelanocytes within the epidermis and dermis, with associated pigment deposition.

Mongolian spots (or dermal melanocytoses) likely occur from lack of complete migration of melanocytes from the neural crest to the skin. The melanocytes become suspended in the dermal tissue, and the bluish color noted clinically results from a phenomenon known as the Tyndall effect. When particles (melanocytes) are scattered in a suspension (the dermis), blue light is scattered more strongly than red, and the skin of the affected area appears faintly blue or gray.

Ash leaf macules and nevus depigmentosa result from a local decrease in melanin within the basal epidermis. Melanocyte number may be normal or decreased. Multiple ash leaf macules are associated with tuberous sclerosis.

Capillary malformations of the face and neck occur when an increased density of small capillaries are present within the dermis.

Nevus sebaceus represents a local collection of normal or hypertrophied sebaceous glands.

Cutis aplasia is localized congenital absence of skin without preceding trauma. The cause is unknown.

Dermoid cysts result from failure of fusion of embrylogic skin planes. The cyst is thus composed of normal epithelial structures, including squamous epithelium, hair follicles, sebaceous glands, and other adnexal structures, encapsulated or sealed off as a pouch from the surrounding tissue. These cysts are sometimes termed whole skin cysts, reflecting their numerous components.

Accessory tragi represent a developmental defect of the first branchial arch.

Thyroglossal duct cysts represent failure of complete obliteration of the embryonic thyroglossal duct.

What laboratory studies should you request to help confirm the diagnosis? How should you interpret the results?

Laboratory studies are not indicated in the evaluation of most birthmarks. Histologic examination is not necessary. If biopsy is performed, the involved cutaneous structures can be demonstrated on routine hematoxylin and eosin staining.

Would imaging studies be helpful? If so, which ones?

Imaging studies are not necessary in most cases.

In cases of multiple café au lait macules and suspected neurofibromatosis, imaging of the sphenoid wing may show dysplasia.

In cases of multiple ash leaf macules and suspected tuberous sclerosis, a multidisciplinary approach to evaluation is indicated. This may involve imaging of the brain, lung, heart, and kidneys to investigate for other characteristic signs of the syndrome.

Ultrasonography of the scalp in cases of cutis aplasia can indentify any underlying bony defects.

Midline dermoid cysts should be evaluated with magnetic resonance imaging before surgical excision to exclude the possibility of encephalocele, nasal glioma, ectopic neural tissue, or an underlying intracranial connection.

Evaluation of thyroglossal duct cyst with ultrasonography or nuclear scan is recommended before surgical excision. This will exclude the possibility of ectopic thyroid tissue, bronchogenic cyst, or lymphadenopathy.

If you are able to confirm that the patient has a birthmark, what treatment should be initiated?

Treatment of most birthmarks is generally not necessary or indicated.

Café au lait macules, Mongolian spots, and ash leaf macules may become less noticeable with time, as the skin naturally darkens with age. Mongolian spots are the most likely to fade, with rare lesions persisting after age 5 years. Laser treatments are generally ineffective. Excision is theoretically possible, but the resulting scar makes this a poor option, and parents should be discouraged from surgical removal of these lesions.

Congenital melanocytic nevi do not fade with age and grow in proportion to the child. If dark hairs within the lesion are cosmetically bothersome to patients, the hairs can be cut, plucked, shaved, or dyed. The management of congenital nevi is controversial. Small congenital nevi have not been shown definitively to pose a significantly increased melanoma risk over time. Large congenital nevi (>20 cm) do have an increased risk of melanoma development. Some authors recommend prophylactic excision of congenital melanocytic nevi at puberty. However, careful clinical observation and patient education about melanoma signs and risk factors is appropriate in most patients with small congenital melanocytic nevi.

Capillary malformations tend to fade by age 2 years, with those on the posterior neck being the most likely to persist into adulthood. For lesions that are diffuse, very dark, or cosmetically bothersome to patients, treatment with the pulsed dye laser (585-595 nm) can be effective. This usually requires multiple treatments over several weeks to months.

Cutis aplasia does not require treatment. If the resulting defect, scar, or alopecia is cosmetically bothersome to patients, the affected area can be excised, and the normal skin approximated.

The management of nevus sebaceus is controversial. Treatment in infancy and childhood is generally not recommended. During puberty, hormonal stimulation of the involved sebaceous glands can result in thickening and "warty" like papillomatosis of the lesion. Patients may complain of frequent irritation from shampooing and hair care and may be bothered by the appearance. In addition, there is an increased risk of development of secondary neoplasms within a nevus sebaceus after puberty (most commonly benign lesions including trichoblastoma and syringocystadenoma papilliferum, although basal cell carcinomas and squamous cell carcinomas have been reported). For these reasons, many authors recommend prophylactic surgical excision of nevus sebaceus at puberty.

The indication for removal of accessory tragi is cosmesis. They can be treated with simple excision with local anesthesia in the outpatient setting .

Dermoid cysts and thyroglossal duct cysts that are frequently traumatized, infected, or otherwise symptomatic can be treated with surgical excision.

What are the adverse effects associated with each treatment option?

Pulsed dye laser used for treatment of capillary malformations is painful, and results in postprocedure bruising.

Surgical excision of any birthmark carries the risk of outpatient skin surgery, including pain, bleeding, infection, scar, unwanted cosmetic outcome, and recurrence of the lesion.

Clear confirmation of the correct diagnosis of thyroglossal duct cyst is imperative before surgical excision, as accidental removal of ectopic thyroid tissue can result in iatrogenic hypothyroidism.

What are the possible outcomes of birthmarks?

Most birthmarks do not resolve spontaneously, and persist throughout life. Café au lait macules, Mongolian spots, ash leaf macules, and capillary malformations may become less noticeable over time.

What causes this disease and how frequent is it?

Solitary café au lait macules are common, occurring in approximately 2% of newborns. Café au lait macules associated with neurofibromatosis, McCune-Albright, and other syndromes are more rare.

Small congenital melanocytic nevi occur in 1% of newborns. There is no sex predominance and no known genetic or familial influence.

Mongolian spots are very common in dark-skinned newborns and are seen in 90% of Asian, 80% of black, 45% of Hispanic, and 10% of white neonates. Nevus of Ito and nevus of Ota are also more common in Asian newborns, and show a significant female predominance (3:1 female to male ratio).

Solitary ash leaf macules are common in normal newborns. However, more than one lesion at birth should prompt evaluation for tuberous sclerosis, as up to 90% of patients with tuberous sclerosis will show multiple ash leaf macules at birth.

Capillary malformations are very common, occurring in 40% of infants. They are more common in white neonates and do not show a sex preference.

Nevus sebaceus occurs in approximately 0.3% of infants.

Cutis aplasia occurs in 1/10,000 live births. It is most commonly an isolated defect but can occur in association with other syndromes such as Opitz syndrome, Adams-Oliver syndrome, and epidermolysis bullosa.

Dermoid cysts are common in neonates, but less than half are noted at birth, with the majority recognized by age 5 years.

Accessory tragi and thyroglossal duct cysts, like many developmental cysts and sinuses of the branchial clefts, are relatively common. Parents may give a history of similar lesions in relatives, although single-gene defects have not been identified.

How do these pathogens/genes/exposures cause the disease?

There is no unifying genetic defect responsible for the development of birthmarks. Patients who present with birthmarks as a cutaneous manifestation of an underlying genetic syndrome will have associated gene defects.

What complications might you expect from the disease or treatment of the disease?

Birthmarks unassociated with syndromes generally do not present with complications other than unwanted cosmetic appearance.

Rarely, dermoid cysts and thyroglossal duct cysts can become traumatized or infected. Bony destruction from large cysts has also been reported.

How can birthmarks be prevented?

There is no known therapy or intervention available for preventing common birthmarks.

What is the evidence?

Alper, JC, Holmes, LB. "The incidence and significance of birthmarks in a cohort of 4,641 newborns". Pediatr Dermatol. vol. 1. 1983. pp. 58-68.

Eichenfield, L, Larralde, M, Schachner, LA, Hansen, RC. "Neonatal skin and skin disorders". Pediatric Dermatology. CV Mosby. 2003.

Lucky, AW, Eichenfield, LF, Frieden, IJ, Esterly, NB. "Textbook of Neonatal Dermatology". WB Saunders. 2000.

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