Yes, your son seems to be allergic to shellfish. This is a serious allergy and if he has shellfish again he may have a very severe allergic reaction. It is vitally important that he does not eat shellfish again. He can eat ordinary fish but it must not be in contact with shellfish while being prepared. He should be tested for shellfish allergy by his paediatrician. He will need to have an antihistamine syrup with him at all times. Zyrtec or Allecet syrup is best and he will need a dose of 2.5ml immediately if he has another allergic reaction in future.It would be best to take him to be seen by a paediatric allergist.
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