Sarcoptes scabiei

Boy’s progressing rash could delay surgeryA preoperative evaluation is requested for a 15-year-old boy who is a renal transplant patient maintained on oral mycophenolate mofetil and tacrolimus. His parents are worried that an itchy rash on his hands and feet, which has been progressing over the last 4 months, will result in postponement of his surgery.
Infant with a persistent nodular skin rashThe worried mother of a 4-week-old boy brings her son to you for evaluation of a rash that started 3 weeks ago on his left eyebrow and chest, then spread to his back, arms, and legs despite treatment with topical steroids. What’s your diagnosis?