Thankfully the answer to this question is no. This is not to say that you shouldn’t always treat a ringworm infection at the earliest possible moment however. Ringworm infections come in different shapes and sizes and you never know when or how a severe one can be caught. Severe infections can be extremely uncomfortable and very unsightly and last for up to 2 months if not treated. In addition, not treating infections will increase the likelihood of recurrence which is you want to avoid. But you can rest assured that a ringworm infection will not cause you fatal harm.