Swelling of gums

I think it is oral allergy. Just avoid eating apples to prevent the swelling of your gums.

What you are talking about could be Oral Allergy Syndrome.it usually happens to a cross-reactivity between plant proteins from pollen and fruits or vegetables. So when a child or adult with pollen allergy eats a fresh fruit or vegetable, the immune systemdefine sees the similarity and causes an allergic reaction. Interestingly, many people with oral allergy syndrome can eat the same fruits or vegetables when they are cooked. The cooking process changes the protein enough that the immune system does not recognize the food as being the same as the pollen anymore.

Its most commonly seen in people with asthma or hay fever from tree pollen who eat fresh (raw) fruits or vegetables.

In most cases it does not require medical treatment. It is best to avoid the offending foods. Often just peeling or cooking the food will reduce the effects. At times, an antihistamine can effectively relieve the symptoms. In adults and children with severe recurrent OAS, immunotherapy (allergy shots) to the pollen have been useful.