Without seeing a photo, it's just a guess. Is it just the face that's red or the whole image? If it's just the face you can use an adjustment brush and adjust the color or saturation. There are a number of portrait presets available that can do this with a click. Check if it's the whole image that has a color cast. Then adjust the temperature. That's often the case.
In PS, I'd mask the face and do a color balance adjustment or a curves adjustment in the red channel. If it's only part of the face that's red, then the clone stamp tool would work.
michael mckee
My Port Townsend – A City in Photographs