What are the sores on Immortan Joe?

What are the sores on Immortan Joe?

We were shown in the beginning that Immortan Joe also has those tumors, may be it’s because they’re extremely unhealthy/ill. Nux is also unhealthy and has tumors, so, he keeps on transfusing Max’s blood from a pipe injected into Max’s neck. Those were his tumors and he nicknames them Barry and Larry.

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