18 month old with s/s of mild fever, blanching rash to face, sore throat, sinusitis-like symptoms with clear drainage for over 2 weeks. Rash is noticeably itchy. Blanching rash of face comes and goes-saw this occur within the 45 min office visit. RAST panel neg, platelets 420, ESR 63, glucose at 108, BUN 20, Creat 0.28, AST 37, ALT 20, UA not attainable at visit. What type of follow up? Started patient initially on amox as patient has otitis media of right ear, +3 tonsils, low grade fever. Now starting on prednisolone: follow up testing for finding correct diagnosis?