You might want to also look into a mold allergy. I have problems with nuts, especially ground nuts, I get blisters and bumps (no problems breathing). No matter how much you wash a nut there will always be a little residue of mold, ground nuts being worse.  Some brands being worse than others...

Very true @MBee .  Peanuts are legumes (Beans & Peas) and grow in the roots of the peanut  plant.  A tree nut allergy doesn't preclude an allergy to peanuts, but it doesn't mean there can't also be an allergy to peanuts as well.

Almonds and peanuts are in different families.  I'm not even sure an almond is a tree nut, per se.  I know that a peanut is a legume.  Tree nuts are walnuts, pecans, etc.  Almonds are related to peaches.  (think about what a peach pit looks like before and after it breaks open)

I know this because I have a girl in scouts who is allergic to tree nuts, but dislikes peanuts.  She will tell folks she 'has a nut allergy' and send a kitchen into a panic unless I catch wind of it.  (in her defense, I don't think her intention is to cause problems, just to get a different sandwich - it is the law of un-intended consequences.  Folks are hyper vigilent.)

All of that to say that if he reacted to an almond, the problem may not be as big as you think.