No need to change anything, though if this is in the rear tire another 10psi might be OK. i said it happens especially with underinflation, but it also happens when all is right in the world. For example the tire may have a woven belt under the tread, and the crack is at the edge of the belt, kind of like how a black top road may develop cracks at the concrete road bed edge.

it's fine to keep an eye on it, but don't lose any sleep because it's not an indicator of anything to worry about.