LG pooing several times a day

Over the last week or so my LG has been doing really small frequent poos, don’t will happen several times a day. Sometimes they’re that small I don’t notice and it’s now giving her nappy rash. I took her to the doctors today but she was more interested in fixing the nappy rash than getting to the bottom of why she’s pooing so regularly. I can see us going back because it’s pointless putting on cream if she keeps pooing as often as she is. Has anyone else had this? She’s formula fed and hasn’t taken to weaning at all so isn’t eating solids so can’t even blame it on that.