5th February 2024

You see a strange rash in a 10-year-old child, who presents with clusters of small red-to-black papules, predominantly along the umbilicus and upper thighs.

You see a strange rash in a 10-year-old child, who presents with clusters of small red-to-black papules, predominantly along the umbilicus and upper thighs. Similar lesions are seen in his oral mucosa. Your consultant suspects a lipid metabolism disorder. 

Which of the following is the most likely diagnosis?