good evening , my baby is 8 moths old and her lip got redish and she is not able to eat how to cure this , anyone please suggest me and help me please

A. Hello mom seems to be like ulcer would suggest to get her examined and medication. May be required , give her some cold foods like fruit juices or purée C steamed vegetables, avoid strong flavour like black pepper as such , give her curd rice or butter milk , kichidi etc.