Spots On The Front Torso Only. Red With Feathery Edges,

spots on the front torso only. Red with feathery edges, no spot in center, about 3-6 mm oval mostly. no itching on a 14 yo healthy boy. No other symptoms. Onset about three days not progressing but not improving. Sheets were washed in hot water ( pillows) etc. Bed was checked for bed bugs.