An 18-year-old girl develops a widespread rash 5 days after a sore throat. She had presented in a similar way 2 years ago to her GP who treated her with antibiotics and the rash had faded. She does not feel unwell in herself and has no other symptoms. 

Examination 

There are multiple erythematous small discrete plaques and papules with overlying scale predominantly over her trunk but also affecting her limbs. Her face and scalp have been spared. Her nails are normal. Examination of her throat reveals some erythema over her pharynx, but no pustules are seen. A throat swab reveals group A β-haemolytic Streptococcus.

 

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