Oil pressure light

[kmuncc]

My oil pressure indicator has been coming on for the past week or so in my truck for the first few minute it runs. I checked the oil and its fine it is due to be changed but literally just came due, I figured I would start by changing the oil but was wondering if this was a common issue or where to look?

[kmuncc]

Changed the oil today, I noticed that there had been some oil that leaked out of the cap on the filter housing, I hoped that replacing the filter and o-ring would fix it but the issue is still there.