Old house - green colour "bleeding through" paint?

[YodhrinForge]

So I've been in my new-old place for a few months now and I've noticed that over the past few weeks there's a really bright mint green colour that seems to be bleeding through the cream wall paint at various spots, and increasingly so(primarily at edges like the wall/skirting line or next to trim and doorframes). Pretty sure it's not mould or anything like that. Redecorating was something I wasn't going to be doing for ages yet, but I am planning to do renovation work that will involve fiddling with one of the greening walls, is it anything to worry about do you think?

[G and J]

It may be as simple as there was a quick paint job done to make the property ready for sale? What you could be describing areas where there is just less paint e.g cutting in with a brush rather than a roller.

[markc]

+1 if you are concerned, clean off a small patch of the top coat to see what’s underneath … very good chance it’s just a bright green paint (or paper) that’s now grinning through. 

[Big Jimbo]

I with agree with old paint "grinning"