Gianotti-Crosti

Emergencies

Papulovesicular Acrodermatitis of Childhood

Characteristic infantile rash, self-limited and benign. It presents as a monomorphic papular or papulovesicular eruption, with symmetrical distribution on the face, buttocks and extremities (respecting the trunk).

Main Causes

The etiology is mainly viral. It is considered an immunological response (delayed hypersensitivity) to an underlying infection, rather than a direct skin infection.

  • Epstein-Barr virus (EBV): Currently the most common cause in the world.
  • Hepatitis B Virus (HBV): Historically the classic cause (originally described by Gianotti). Nowadays it is rare in countries with systematic universal vaccination, but it should be suspected in unvaccinated patients or in endemic areas.
  • Other viruses: Cytomegalovirus (CMV), Coxsackievirus (A16, B4), Respiratory Syncytial Virus (RSV), Parvovirus B19, Human Herpes 6 (HHV-6), Rotavirus.
  • Bacteria (less common): Mycoplasma pneumoniae, Bartonella henselae.

Gianotti-Crosti and Vaccination

As a vaccine expert, it is crucial to master this topic. Occasionally, the syndrome can be triggered after the administration of certain vaccines. It is essential to manage communication with parents to avoid unfounded doubts (anti-vaccines).

Associated vaccines

It has been mainly described after the administration of live attenuated or inactivated vaccines such as:

  • MMR (SRP / MMR)
  • Hepatitis A and B
  • DTP (Diphtheria, Tetanus, Whooping Cough)
  • Poliomyelitis and Flu

Message for parents

It is not a serious allergic reaction. It is a benign skin immunological reaction that shows that the child's immune system is reacting to the vaccine and creating defenses.

Anti-vaccine protocol / Doubts:

The appearance of a post-vaccine Gianotti-Crosti Syndrome IT IS NOT A CONTRAINDICATION absolute or relative to administer subsequent doses of the same vaccine or to continue with the standard vaccination schedule in Spain. The risk of natural disease is infinitely greater than this cosmetic rash.

Emergency Diagnostic Tips

Key Clinical Criteria

  • Age: Mainly between 1 and 6 years (peak at 2 years).
  • Injuries: Papules or papulovesicles of 1-10 mm, monomorphic, brownish red or copper color.
  • ACROFACIAL Distribution: Cheeks, extensor surfaces of extremities and buttocks.
  • Characteristic respect: It usually spares the trunk, palms and soles (although sometimes there is minimal involvement of the trunk).
  • Pruritus: Variable (absent to intense).

Associated Findings & Warning Signs

  • Lymphadenopathy (cervical, axillary, inguinal) - Very common.
  • Mild hepatomegaly (Especially if the cause is EBV or HBV).
  • Low fever or symptoms of previous respiratory infection.
  • Köbner sign: The appearance of lesions may be observed in areas of scratching or trauma.

Management and Treatment

The treatment is purely symptomatic and conservative. As it is a self-limiting pathology, the fundamental pillar is education and information to the family in emergencies.

Clinical Evolution (Important to notify parents)

Lesions may persist from 2 to 8 weeks (even more). Noting this in the emergency room avoids multiple unnecessary re-consultations due to a "rash that does not go away."

General Care

Mild emollients and skin hydration. Avoid irritants and long baths.

Mild to Moderate Pruritus

Oral antihistamines (e.g. cetirizine, dexchlorpheniramine) for nighttime control or comfort of the child.

Intense Pruritus/Inflammation

Topical corticosteroids of low/medium potency for short periods. Occasionally lotions with calamine.