It's only happened when I have used the lip balm. Thank you for responding.
Hi, the blisters could be due to many causes. If it occurs every time you apply the lip balm it could be an allergic reaction, more so as it is associated with itching. It could also be due to Herpes simplex infection. Here, the virus can lie dormant and can get reactivated at intervals producing symptoms. Another cause could be eczema. So, avoid the balm and see if the symptoms still appear then check with your doctor to rule out a herpes infection. Regards.