The way I do body horror is trying to take a characters characteristic/s, and distort and exaggerate it as much as I can. One of the main points of body horror to me is to test the limits of the body to an uncomfortable degree. Body horror can also be used to disturb the reader/viewer, you could make it very gross and/or uncomfortable, it just depends on what you're going for. I'd advise you use horror manga artists like Junji Ito's work as reference. Try to avoid making it look dumb or goofy, it doesn't have to be extremely detailed, but it would heavily add to the gross factor.
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BroSkullEmoji
A lot of the philosophy behind body horror revolves around how much you can distort the human body without making it look goofy or forced.
There are many ways to achieve this, I recommend to look at body horror media for better examples AND inspiration, this really helps a lot.
Also, body horror can overlap with gore, though this doesn't always happen, you can have little to no blood and still give off that "getting under your skin" feeling.
Another advice is to combine wild things, don't limit yourself, you don't have to only put eyes everywhere or a mouth where it's not supposed to, you can add things like octopus tentacles, spider legs, some other thing that I don't know how to describe, go crazy.
Here's an exmaple of mine: https://www.newgrounds.com/bbs/topic/1531667#bbspost27826779_post_text
It helps to start with an already functional, not corrupted subject and start to distort it and destroy it to get a better grasp of what you're going for.
I'd say that's about it