It would be appreciated if you could provide us with the picture of how it looks like. Reason being that it required clinical examination. Till time i am providing you with two optional diagnosis:
Diagnosis 1: It can be "Pyogenic Granuloma" which is a common gingival infection occuring due to gingival trauma or gum irritation. This time of swelling usually occurs in between the gums. The area is termed as "Interdental gingiva". Dont poke or touch the swelling as it will profuse badly.
Here is an image of pyogenic granuloma
Treatment 1: Scaling is advised and if the swelling is large than go for surgical excision.
Diagnosis 2: It can be gum inflammation due to intake of hot or hard food stuff.
Treatment 2: It is advised to do warm saline gargles thrice daily and change your tooth brush to soft bristles tooth brush. Maintain a good oral hygiene.
For more info on gum related diseases visit the link....http://www.identalhub.com/articlecategory-gum-diseases-9.aspx