the whole under-area of the nose seems to be discoloured
Lighting artifact.
If you look at the third / last photograph you see what looks like a large reddish stain on the tarmac. Likely not related to the incident, but its diffuse reflection on the white fuselage is what gives the fuselage a reddish tinge in the photograph. Crappy cellphone camera and jpeg compression make it appear even more pronounced especially in the first pic.