An abscessed tooth (tooth infection) causes Ludwig’s angina. In 9 of 10 cases, the infection starts in the second or third molar in your lower jaw. Ludwig’s angina is a rare form of cellulitis. This bacterial infection affects your skin and underlying tissues. Group A streptococcal infections and staph infections can cause cellulitis. When you have Ludwig’s angina, the cellulitis infection spreads quickly in your mouth to your tongue and throat area. Swelling (edema) occurs, which can make it difficult to breathe.