It is normal for lips to be hard and stiff after suture removal, usually due to scarring caused by muscle tissue and connective tissue repair. 1. It is normal for lips to be hard and rigid after suture removal, usually due to scarring caused by muscle tissue and connective tissue repair. Usually this hardness takes three months to six months after surgery to subside completely. 2. This is due to a lot of muscle tissue inside the lips, connective tissue, controlling the activities of the lips, in the suture time, in the internal to the muscle alignment neatly, in order to ensure that after the healing of the lips activities coordinated. As the tissue healing scar proliferation subsides, the hardness of the lips after sutures will slowly subside. If there is any discomfort such as fever, it is advisable to seek medical attention.