Wound healing for a month is still swollen, may be a physiological phenomenon, the wound in the healing process, the surrounding tissue regeneration, there will be swelling and hardness, this is a normal physiological phenomenon, can be relieved by hot compresses. Secondly, it may also be caused by wound infection, which requires further diagnosis. Infected wounds are prone to pseudo-healing, where the surface has healed, but the subcutaneous tissue is infected, and the wound area will be red, swollen, burning and painful. You can use iodophor to disinfect the area, and then apply erythromycin ointment, be sure to observe the changes in the wound, more serious bleeding, pus can be timely consultation. Wound healing for a month is still swollen, may also be caused by other conditions, the wound site if there is pus, infection and other phenomena, it is recommended to consult a doctor in a timely manner, to avoid causing other adverse effects.