Watermelon cream, vitamins such as vitamin B or multivitamins can be used for mouth ulcers during lactation. Breastfeeding is not the key issue, what drugs should be used for mouth ulcers during breastfeeding, the key is to find out how mouth ulcers are caused. There are many reasons for mouth ulcers, such as immune, nutritional, that is, immune dysfunction, malnutrition, such as poor diet during lactation plus breastfeeding, maternal resistance is weak, which is also possible. There is also traumatic, may accidentally bite the lips or bite the oral mucosa, the bite will also appear ulcers. In short, the appearance of mouth ulcers must find the cause, targeted treatment, whether it is a lack of vitamins or lack of nutrition, or traumatic, immune, we must find the cause of targeted treatment. As for breastfeeding, there is nothing special, what drugs should be used, but breastfeeding should pay attention to the physical condition of maternal, that is, postpartum women, why there are mouth ulcers, this is worth noting. The mouth ulcer itself is not a big problem, but it must be targeted to find the cause to be able to.