A 5-year-old boy had pain and weakness in his legs and had trouble climbing stairs. He had a dramatic rise in CPK followed by erythematous papules on the hands, as shown, and a rash around the eyelids. Which diagnosis is most likely?
A 5-year-old boy was having difficulty in walking up stairs; he complained of pain and weakness in both legs. His CPK had risen from 1252 U/L to 1400 U/L in 2 weeks. His CBC was normal. Two months later, these papules developed over his proximal and distal interphalangeal and metacarpophalangeal joints along with an erythematous rash around the eyelids.

Which diagnosis is most likely?
FDA Approves Guselkumab for Pediatric Plaque Psoriasis and Active Psoriatic Arthritis
September 30th 2025The FDA has approved guselkumab for children aged 6 years and older with moderate to severe plaque psoriasis or active psoriatic arthritis, making it the first IL-23 inhibitor authorized for pediatric use.