The best way is to see doctor for this scenario, nobody on the Internet can give u medical advice.
It might be due to this balm but also depends on alot other factors like have u fed baby differently as well? Or u r still bf-ing n u possibly had ate some high allergen food or had intro different solids to baby, which baby can have allergy to. Or had changed the FM. Some products r not suitable for babies. Anyway babies can be v sensitive, even to dust. U can ask Pd to do prick test if u suspect of allergy.