It will be the crank seal that has come out, and they only come out for a reason. Worn pump, engine worn (breathing, crank nose wear).
Like i said we can take front apart and check for crank wear if all is ok then then we can try just a seal, but their is no garantee this will work and you will have to have the oil pressure sensor fitted.
next step would be oil pump and if all this fails a rebuild is required , so as you can see you could spend more trying to cure the issue in the long run.
I was just putting you in the picture as to what normally happens in these situations, ultimately the route you wish to take is yours we can only advise