Are these just blisters?

[SoIe]

DD10 has just come home from a day of walking around a bit more than she usually does.

She has these weird spots on her feet (both feet) that look like tiny blisters, but I am not sure. Can anyone tell me what they are, please?

I didn't notice them earlier today, and nor did she.

Bump (no pun intended).

They do look like blisters. What sort of shoes was she wearing and did she have socks on?

If she was barefoot she may have stood on plants that have irritating sap in them.

Thank you. She just had trainers on - slight trendy as opposed to athletic ones, but she's worn them several times before. Yes she had socks on. She's not been barefoot today, but she was barefoot in the garden yesterday, and it may be that these are from then, only we didn't notice.

Just a morning bump, These have gone down considerably this morning. Still interested to know if anyone has any idea what may have caused them.

Just hoping for any ideas! They are still on her feet, but not as obvious as yesterday.