What is this?!

My daughter just got this inside her lip .. and I have no idea what it is , it doesn’t seem to bother her but when I try to open up her mouth to see it , it cry’s ... can anyone tell me what it looks like ? I’m taking her to the doctors tomorrow because it’s closed right now and my husband is working..

Update .. it is trush .. thank you for everyone that has commented .. I only breastfeed so her doctor said I might have it too .. does anyone know how I can get rid of it ?