Dear Doctor,

I am having pustule under my stomach – The pus is not coming out & its big. Its so painful that I can't do anything – even walking is very painful.
This has happened before quite a few times. Here local doctors says it can be heat of the body or may be bacterial infection.
I am pure vegetarian & never ate fish, meat or even egg.
Please advice me why this is happening? Is it because of eating particular food/cloth allergy?
I am so damn in pain that can't even keep my head down. Even can't sleep.
Please. Advice.
Thanks/regards,
Chinmay

Sounds like what we call a boil.

Its not from what you eat. THis link has a lot of information on what they are and what causes them.

Boils

How big?
Don't squeeze it, that can send infection into the body. Have it drained with a sterile needle.
You may be lacking something in your diet, or it may be from a lingering infection, we can't know online.