Ulcer or absess

[ajjj987]

Have had this around a week now been to the dentist been told its an ulcer but unsure if it's an absess. Been told to leave alone for a couple of weeks and see but I'm concerned if it's an absess will the infection spread. Can I have an opinion on this please

 

[ajjj987]

 

[Dr M]

Impossible to say if it is an abscess without an x-ray. The quality of the photo is also poor.