Green cheek conure chick

by brian Vibert
(Preston, Lacnashire, UK)

Green cheek conure chick

Green cheek conure chick

i have been hand taming to green cheek conure chicks and i have noticed that the left side of the chicks mouth (below mouth) has swollen on both of them, i dont know if it is an infection, if it's natural and all chicks get it or if it is my fault when i am handfeeding them, i feed them by syringe so im thinking i might have hurt or brused their mouths, please help, if you look at the picture one side is bigger than the other