I have beauty spots on my back and chest. the one on my back is more red and i bit swollen. do i have to go see a doktor?

Is it black in color: Black moles are sometimes called Beauty spots. But they can be moles(if flat) and a changing mole needs a medical examination from a doctor. Since you have noticed some swelling/irritation go see a doctor to make sure you do not have melanoma...a type of skin cancer that can occur even at a young age. Do not delay as it can be a serious problem, sometimes..most are benign and harmless.