“1000-Lb. Sisters” star Amy Slaton is missing a good chunk of skin from what she says is a camel bite … and TMZ has the first look at her gruesome injury.

We obtained a photo of Amy’s flesh wound, which she suffered Monday at the Tennessee Safari Park in Alamo, TN … before she got arrested on drug charges.

The injury photo shows a 4-centimeter-wide section of skin missing from Amy’s right arm … near her inner elbow … and you can see her exposed tissue. The zoo owner’s seen this too, and he claims this clearly shows the wound is not from a camel’s bite.

TMZ broke the story … Amy left the zoo on a stretcher after suffering an injury.

In another blow, Amy ended up being arrested … because cops said they found psychedelic mushrooms and marijuana in her car … with the drugs in plain sight and two kids inside the vehicle.

There is some dispute about what caused Amy’s wound … with the zoo owner saying it is NOT a camel bite.

The Crockett County Sheriff’s Department tells TMZ … the zoo employee who called 911 to report the incident says it WAS a camel bite, and cops are referring to it as such because that’s what was reported.

For his part, zoo owner Jon Conley is adamant this is not a bite wound … he says there’s no way one of their camels bit Amy, and he finds it strange there is no bruised tissue and the skin is fileted open … which he says indicates this isn’t an animal bite. ??‍♂️

CCSD says their investigation is ongoing … and they’re not focusing on what caused the wound, camel or not.