Seasonal allergies and prone to sinus infections however this year chills started 6 days ago, ran for 3-4 nights 102 and ran lower each day (went on 500 mg x 3 amoxicillin starting day 3) rash on both sides of lower stomach above belt line wrapping around sides and on one thigh- flat not bumpy, not it itchy, but slightly warm to touch Rash noticed day 3 and worse day 4, has not gotton worse Any ideas??