Re: Shrimp allergy, but only from skin contact?
FOr the pineapple issue, look up Oral Allergy Syndrome (OAS). SOund like that may be what you have instead of a true allergy.
As for the shrimp, I always get itchy if I shell too many shrimp - more than a pound. I would think it's more the shells. If they were bleached by the supplier, which many are these days, that could also be the cause.