Possible Clues:

• Gruesome as lesion's concealing disease
• Yours truly -- fool to catch the French disease
• Acute infectious viral disease
• Micawber getting terrible sales fever
• An infectious fever
• Viral disease in children
• Spots at a clinic
• Medical complaint, chronic fatigue syndrome, affected sales
• It may be spotted on kids
• Assuming student free from pain after dose of medicine ultimately cures illness