Firstly dont worry about this ..... secondly , the gums are swollen bcz of calculus* and plaque present in between gums and tooth which is leading to tendeness or pain as well as bleeding through gums . This can be easily treated by a procedure called scaling and polishing. Mainly this occurs in lower teeth due to accumulation of salaiva and food particles .
Next Steps
Since calculus is already there , u will not be able to remove it by yourself so visit ur nearby dentist and get the cleaning procedure done and within 2 to 4 days ur gums will start getting healthier .
Health Tips
Calculus - presence of food particles for a longer duration ( like months ) causes the formation of stone hard particles called as calculus