Kieswetter, who has represented England in 46 one-day internationals, sustained a fractured cheekbone and broken nose after a David Willey bouncer sneaked inside the helmet grill while batting on the opening day of Somerset's LV County Championship clash at Wantage Road on Saturday.
Kieswetter, 26, posted a picture on his Twitter account of the damage caused, with his right eye swollen shut and a dark purple patch surrounding the area.
It is not known how long Kieswetter will be absent for, with replacement wicketkeeper Alex Barrow taking his place behind the stumps in the current fixture.