causes of petechiae in mouth
What is Petechiae? Petechiae are small red or purple dots of blood that appear on the skin or in the mucus membranes. The mouth is one mucus membrane where petechiae may occur. Petechiae occur when superficial blood vessels under the skin break. Petechiae may look like a rash. The most common cause of petechiae is through physical trauma, such as a violent coughing fit, prolonged vomiting, or excessive crying.