Jihae of Girl's Day has put on the brakes on her activities due to skin allergies. On November 3rd, a representative revealed to Money Today Star News,

"Jihae suddenly had a skin allergy, so we are planning to visit the hospital. It's a pitiful situation since their activities for their new song are about to begin...The situation is that Jihae's face has swelled up. Although we won't know until she receives an examination at a hospital, it seems like her schedule is going to have to be changed."

Earlier today, Girl's Day attended an event in which they were chosen to be ambassadors against illegal downloading. This latest news explains Jihae's absence from the event. Girl's Day will be making their comeback performance for their 2nd single, "Nothing Lasts Forever", on November 5th through Music Bank. Source: Star News