Quiz: Youth affliction

A 17-year-old patient presents with a six-week history of erythematous, scaly papules affecting her upper and lower limbs and torso.

The plaques first appeared on her abdomen and spread to other areas of the body. They appeared about two weeks after a throat infection, for which amoxycillin was given for four days. She has had amoxycillin in the past with no adverse effects.

There is no contributory past medical history or known allergies. She is not on any medications. She has no pets. She has neither been travelling recently nor had any suspicious contacts.

On examination, there are salmon-coloured, symmetrical papules covered by fine silvery scales on her scalp, upper and lower limbs, and torso.

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