Can I wash my hair if the wound has not healed?
Whether or not one can wash their hair with an unhealed wound depends on the wound's condition. If the wound is small, generally washing hair is acceptable; however, if the wound is large, washing hair is typically not recommended. Detailed explanation is as follows:

If the wound is small and has already been properly treated and dressed—for instance, covered with waterproof dressing to ensure it won't get wet during hair washing—washing the hair is also acceptable and generally will not irritate the wound or affect its healing.
For larger or deeper wounds that have not yet healed, moisture during hair washing may introduce bacteria and other microorganisms into the wound, increasing the risk of infection and delaying wound healing.
Even if the wound is small and nearly healed, gentle movements are necessary while washing hair. Avoid directly spraying water forcefully onto the wound area or vigorously rubbing it. After washing the hair, promptly and gently pat the hair dry with a clean, soft towel, avoiding excessive rubbing around the wound. During and after hair washing, ensure the wound and surrounding area remain clean and dry to reduce the risk of infection and promote healing.