P DDX

 A

Thanks for the image. Based on the appearance — multiple annular (ring-like), erythematous (red) plaques on the infant or young child’s skin — here’s a differential diagnosis (DDx) list:

🩺 Top Differentials:

1. Erythema Multiforme (EM)

   • Target-like lesions (although not all may show the classic "target")

   • Often triggered by infections (e.g., HSV, Mycoplasma) or drugs

   • Can appear on extremities and trunk

   • May be accompanied by mild systemic symptoms

2. Urticaria (Acute)

   • Transient, itchy wheals that may look annular

   • Often due to allergic triggers (foods, meds, infections)

   • Lesions typically resolve within 24 hours

3. Gianotti-Crosti Syndrome

   • Viral exanthem (esp. EBV, Hepatitis B, enteroviruses)

   • Symmetric papular rash on limbs, buttocks, and face

   • Usually in children under 4 years

4. Tinea Corporis (Ringworm)

   • Fungal infection

   • Annular plaques with raised, scaly borders and central clearing

   • Slower spread, usually not as widespread unless immunocompromised

5. Drug Eruption

   • Morbilliform or urticarial

   • Widespread, possibly annular in shape

   • Look for recent new medications or exposures

6. Erythema Annulare Centrifugum

   • Rare, benign, ring-shaped lesions that spread outward with central clearing

   • Often idiopathic or linked to infections, foods, or drugs

---

📌 Important Clues to Narrow It Down:

• Duration of rash?

• Associated symptoms: fever, itchiness, recent illness?

• Recent medications or vaccinations?

• Any exposure to new foods, soaps, pets, or travel?

Feel free to drop any of that info and I can help fine-tune the differential!