Untreated head lice can indeed affect your health. Head lice are tiny insects that infest the scalp and feed on blood from the scalp. The bites from these lice can cause intense itching and irritation, leading to scratching and potential skin infections. In severe cases, excessive scratching can result in open sores on the scalp, which can become infected and lead to further complications. Additionally, the constant presence of head lice can cause emotional distress, social stigma, and disruption in daily activities. Therefore, it is crucial to address head lice infestations promptly to protect your health and well-being.