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Our allergist told us that it's REALLY common to get false positives with allergy tests, which is why he won't do broad allergy testing. He only tests for specific things when there has already been an allergic reaction, just to confirm the allergy. So I would take that into consideration when you pursue testing.

ETA: Considering your LO has been on almond milk and has this rash, it's possible he's having a reaction to tree nuts. Have you considered trying a non-nut based milk to see if that helps? Rice milk or hemp milk might be good alternatives.

We had an allergist as well and were told that false positives before 2 were super common (we had 3, eggs and both kinds of nuts were positive and she's not allergic now at 3.)

Remember sensitivities are different than allergies. And our allergist also told us to continue to give the foods that might cause a slight reaction to build up tolerance (obviously not the case for severe allergies, although it doesn't sound like your son is in that category.) Berries because of acidic content could be the diaper rash cause, I would try an alternative to almond milk, maybe soy or hemp. Tree nuts are a common sensitivity in kids (and also don't offer a lot of fat that kids need for brain development at this age.)

Our experience was a little different, but my LO had multiple food intolerances as an infant and we did allergy tests at age 14 months (skin pricks). She was tested for everything that I had needed to eliminate in my own diet, plus a number of other common allergens. Her main symptoms were blood in diaper, rashes, and fussiness before I started the elimination diet (but that was almost a year before the allergy tests). Our pedi probably wouldn't have done the allergy tests if those were the only symptoms but she also had a couple incidents when we introduced solids where she vomited and got what looked like hives after eating certain things.

In our case, her results came back totally clear and we gradually re-introduced all the foods over the next few months. The allergy testing was helpful for me because I was terrified of giving her something she would react to and it really eased my mind to get all negatives. I was definitely aware that there was a chance of false positives though.