Question

A 2-day-old neonate presents with blistering/erosive skin lesions over the face and abdomen. There is no fever and no mucosal involvement. The mother has a history of an autoimmune blistering disorder. What is the most likely diagnosis?

• A. Neonatal pemphigus from transplacental transfer of maternal antibodies
• B. Staphylococcal scalded skin syndrome (SSSS)
• C. Bullous pemphigoid (BP)
• D. Epidermolysis bullosa (EB)

Hint:

Well, afebrile baby + mother with an autoimmune blistering disease = passively transferred IgG.

Answer 1

The Correct Option is A

Step 1: Use the timing and triggers. Lesions appearing within 1-2 days of birth, with an afebrile infant, no mucosal involvement, and a mother with autoimmune blistering disease, point to a passively transferred antibody-mediated process rather than infection or a structural defect.

Step 2: Mechanism of neonatal pemphigus. Maternal IgG anti-desmoglein antibodies cross the placenta and cause transient acantholytic blistering in the newborn (neonatal pemphigus). It is self-limiting as maternal antibodies are cleared over weeks, and systemic toxicity/fever is absent.

Step 3: Exclude infection (SSSS). SSSS is caused by staphylococcal exfoliative toxin, typically presents with fever, irritability, periorificial crusting and tender erythroderma with a positive Nikolsky sign, and would not be tied to a maternal autoimmune history. The afebrile, well neonate with a relevant maternal history argues against SSSS.

Step 4: Exclude BP and EB. Bullous pemphigoid is a disease of the elderly and is exceedingly rare neonatally. Epidermolysis bullosa is an inherited mechanobullous disorder triggered by friction/trauma sites, not by maternal antibody transfer, and is not autoimmune. Neither fits the transplacental, afebrile, mucosa-sparing picture.

Key fact: Afebrile neonatal blistering without mucosal disease plus a mother with pemphigus = neonatal pemphigus from transplacental maternal antibodies.