Oh deer!

Nightmarish photos of deer growing mutant-like black bubbles are now spreading like wildfire on social media — soon after sightings of growth-ravaged squirrels and rabbits across the US sparked fears of disease outbreaks.

The slew of images popping up online show various deer roaming through backyards and the wilderness while covered head-to-hoof in huge boil-like warts. 3

Despite being grotesque-looking, the golf ball-sized warts — officially known as “fibromas” — are just non-cancerous tumors, according to wildlife officials .

The warts, which can spread from deer to deer, most often grow on the animal’s head and neck but rarely affect overall health.

The freaky photos started going viral after sightings of “zombie squirrels” and “Frankenstein rabbits” stoked con

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