In scarlet fever there is fever, abdominal pain, sore throat but there is a classical sandpapery feel rash
which helps in
its diagnosis. Rheumatic fever
is characterized by appearance of a rash, skin nodules, joint pains, fever, heart problem, and involuntary movements .In acute posts streptococcal glomerulonephritis there is edema, hematuria, and hypertension with or without oliguria .Hypertension may cause severe headache. Get his blood pressure checked. How severe was the concussion?