While it is not common, some individuals may have severe allergic reactions to a velvet ant stings leading to symptoms such as difficulty breathing, throat swelling, rapid heart rate and even anaphylactic shock. It's important to note that the severity of the symptoms can vary depending on the individual's sensitivity and the number of bites or stings received. If you are concerned about a specific bite or sting or if symptoms persist or worsen, it is recommended to consult a healthcare professional for proper evaluation and treatment.