Foreskin is red all the time but after masterbation it gets even more red and sore, uncircumcised.?

Lubricate. Retract the foreskin and wash the area with a mild soap a few times a day. When masterbating use enough lubrication. Petroleum jelly is most slippery, but stains material (sheets, underwear.) go easy so you don't traumatize yourself. If it is not an infection it should clear up. If needed see the doctor.
See derm. You should see a dermatologist because this can be caused by many different things.