A ghost cannot harm you. Spirits on the other hand can possibly harm you. In most cases a spirit may be trying to get your attention somehow and not actually trying to hurt you, (ie: moving an object that lands on your foot). There is real no threat when it comes to ghosts and spirits. Demonic entities or “negative” entities can in fact physically touch you more so than a spirit. Scratches or burn marks may appear on the skin, but in very, very rare cases does this type of haunting ever occur.