What the heck is this?!

Coupe • FTM to my little boy 🇺🇸🇵🇹

Okay so every once and a while, these spots show up on my 3 month old. Sometimes it’s just red, and others there’s a small bump inside the red almost like a small hive.

He got these in the photos after giving him a bath just like I always have with the same wash as always. Not changes were made lately in his diet.

I just don’t understand this? Could it be heat rash? Idk... help me out mommas.