Some suturing devices include a pair of flexible arms configured to force two pieces of tissue together and form a protrusion defined by the two pieces of tissue. Some suturing devices include a third flexible arm including a movable needle configured to apply a suture through both pieces of tissue of the protrusion. Some suturing devices include an actuator configured to move each flexible arm of the pair of flexible arms independently relative to the tissue and move the third flexible arm relative to the tissue. Some suturing devices include a pump configured to generate a suction force through the pair of flexible arms to force the tissue towards the pair of flexible arms.