Howard scored his 13th goal of the season as the Foxes maintained their nine-point lead at the top of the League One table with a 1-0 victory at Millwall.
But the striker also collected his 10th booking of the season, meaning he will be unavailable for Saturday's home game against Colchester and the crucial clash at promotion rivals Peterborough the following week.
"I was disappointed with the booking. I talked to the referee about it and asked if he would have booked him without the response of the crowd and their players," said Pearson.
"But you have to take it on the chin. It happens and we have to deal with it."