odd swelling might be caused by his histamine reacting to histamine.....yes, his own body might not feel friendly towards the different types of histamine in his body.

or.
could still be seeds, or colourings causing a delayed reaction. annato, that natual yellow colour comes from a seed.....

or it could be both

son is going ton two different types of  anti histamine.

still awaing test results that have been sent over EU, one being a issac test, which its  long detailed list of his blood dna .  This will help doc place him on how allergic he is, if he is a oas person or just reacts to certain types of proteins in his allergens.
How useful this will be only time will tell.

All i can say is that we have a two teams working on his case in two different hospitals.  Long live the NHS!