Derm Dx: Worsening scalp, axillae rash in an infant

A patient, aged 10 weeks, presented to the office. His parents complained of a rash on his scalp, axillae, and groin.

Clinically, the rash appeared to be seborrheic dermatitis, but the skin condition worsened after the infant underwent multiple treatments for seborrheic dermatitis six weeks prior.