I have got itching on my genitals and in between my buttocks and i later got rashes on the back of my palms and skin infection?

Visit the doctor : The description of itching in your genitals and back of the palms, without additional information (meds, allergies) in an 18 years old man (unless stated, presumptively sexually active), there are several possibilities. Infections, some contagious, must be ruled out.It is very important to visit a doctor to see the rash more importantly, to discuss the specifics of your case in a timely manner.