J.T.
Allergies can be a funny thing. This may be an early warning sign that a shellfish allergy, a more serious one, is forth-coming. The more you come in contact with shellfish, either by touch or ingestion, it can ramp up the reaction. The reaction may not be as gradual as it has been in the past either. One day you could just have itchy fingers, the next you won't be able to breathe. I would definitely get a test done to be absolutely certain.