Should I be worried about this leak

[Pain43]

I was doing an oil change today and noticed this residue wondering if I need to replace the seal or not

 

[IDSandman]

Nah. Leaks are good. They keep the undercarriage lubricated and the rust away. Plus you mark your territory in the parking lot like an alpha male.

 

[Jeepwalker]

I would. Just because 1) it's not very difficult to do and you can do it now when the time fits into your schedule. 2) one of these days you'll forget to check your diff fluid and then possibly melt a bearing. Or 3) it could suddenly get worse.

I would degrease the area and make sure it's definitely the seal (not oil from something else). Sure looks like the seal, but I've been fooled before.