An 8-year-old boy was seen in the ED for sudden, extreme tenderness of the soles of his feet. He now sees you, in primary care.
He is a healthy child; results of lab tests are normal; he doesn't walk in bare feet; lumps are painful to minimal pressure.
Differential diagnosis: Pressure urticaria, cellulitis, chilblains, cutaneous larval migrans, traumatic plantar urticaria, vibratory angioedema, eccrine hydradenitis, contact dermatitis.
Traumatic plantar urticaria characteristics: sudden onset, progressive with continued activity; spontaneous resolution with rest; confined to soles
An 8-year-old boy's mother takes him to the emergency department (ED) when he complains, suddenly, that the soles of his feet are extremely painful. He is an otherwise healthy active youngster. After laboratory tests are run, he is discharged from the ED with instructions to follow up with his primary care physician. See how the case unfolds, above. Do you recognize the lesions? What's in your differential diagnosis?