Baby rash/milk allergy?

I'm sure there are plenty posts about baby rashes, but I was wondering if anybody experienced this type of rash? It's only on the face close to ears, behind the ears and on the forehead.

I introduced solids when she was 5months, she seemed to be ok. This week i decided to try and give her a spoon of plain yoghurt to see if she will have any reaction. The rash she had few days before i gave her the yoghurt, but then i ate some mushrooms with creme fraiche and a slice of pizza although all 6 months I was avoiding dairy.

She seemed ok after the yoghurt just got more gassy (she was very gassy since birth) and this rash seems to be getting worse (today was the third day of yoghurt)

There are no other signs of cow milk allergy. Her poo is a bit mucusy, but it was like this any the time and doctors couldn't find the reason for it.

She used to get rash from my boyfriends bears but it was going away in 15-20mins and this is here 5 days already.

If anyone would have any ideas about it it would be great, because I'm going mad already breaking my head 😓