Blue-black discoloration on the buttocks, back, and sacral region of a newborn is called?

NHM UP Staff Nurse - 2019

Child Health Nursing (Pediatrics)

Easy

Appeared in: NHM UP Staff Nurse - 2019

Explanation

The description of a 'blue-black discoloration on the buttocks, back, and sacral region' of a newborn perfectly matches the clinical presentation of a Mongolian spot.
This condition, also known as congenital dermal melanocytosis, is a benign and common finding, especially in newborns with darker skin tones.
It is caused by melanocytes (pigment cells) that are trapped in the dermis during fetal development.
These spots are flat, not tender, and typically fade and disappear within the first few years of life without any treatment.

Option B: Vernix caseosa is not a discoloration but a thick, white, waxy substance that covers the newborn's skin, providing protection.
Option C: Lanugo is not a skin discoloration but fine, soft, downy hair that can be found on a newborn's body, particularly on the shoulders and back.
Option D: 'Buttocks mole' is a non-specific, lay term. While a congenital mole (nevus) can appear on the buttocks, it is typically a smaller, more defined lesion. The term 'Mongolian spot' specifically describes the large, diffuse, blue-black patches common in the sacral area.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Assessment of common integumentary findings in a newborn as background academic context rather than a clinical decision trigger.
The primary clinical relevance is the differentiation of this benign finding from bruising due to child abuse (non-accidental injury).
Accurate and detailed documentation of Mongolian spots at the time of the initial newborn assessment is a critical nursing responsibility to establish a baseline and prevent future misinterpretations.
What if? If the discolored area was raised, warm, tender, or had broken skin, it would no longer be consistent with a simple Mongolian spot. These signs would suggest a potential hematoma, infection (cellulitis), or other injury, requiring immediate medical evaluation.

How to Approach the Question

First, identify the key descriptors in the question: 'newborn,' 'blue-black discoloration,' and the location 'buttocks, back, and sacral region.'
Next, systematically evaluate each option against this description.
Recall the definitions of common newborn skin findings. 'Vernix caseosa' is a white substance, and 'lanugo' is hair, so these can be eliminated.
'Buttocks mole' is too general. The specific medical term for the described presentation is 'Mongolian spot.'
Select the option that is the most precise and widely accepted medical term for the signs described in the question stem.

Concept Tested & Keywords

Q7Hhatqzfok-CxDOOFzXan

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 24-32

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1851-1853

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 157-159