parasite shape gland inside the snail, is this normal?

[viri29]

hello everyone it's been some time since I noticed these parasite shape web things inside my snails. I want to know is it normal or if it is a disease what can I do? my snail is 2 years old but I have 2 others about 1 year old with the same issue

ibb.co/JmDxThB
ibb.co/WyfNkvV

[viri29]

and just to clarify those are images of the breathing hole