If the wound heals well and there are no symptoms of infection, you can wash your hair and take a bath the next day after stitches are removed. It should be pointed out that:

Don't rub the wound too hard when taking a bath.

The water temperature should be lower when taking a bath! Don't take a bath for too long!

According to experience, many patients with forehead injuries go to take a bath the day after surgical suture. They don't wash their hair when they take a shower. Cover the wound with a shower cap.