It is uncommon, but chewable vitamin C tablets like Limcee can sometimes cause temporary irritation to the delicate lining of your tongue due to their acidic nature. This can occasionally lead to small, harmless bumps or mild sores. Sometimes, a mild sensitivity to other ingredients in the tablet might also play a role. Please rest assured that these bumps are usually harmless and tend to heal quickly on their own. Try rinsing your mouth with water after taking the tablet and avoiding spicy foods for a few days. If the sores persist for more than a week or are very painful, please consult a doctor for a quick evaluation.