it is not possible to determine the nature of a rash based on a vague description so you will need to see a medical provider so you can have this all-over rash properly examined diagnosed and treated. since you are concerned that this could be a consequence of unprotected sex seeing a medical provider is even more important. if necessary the medical provider can test you for hiv and other sexually-transmitted diseases. you should get tested. but you might just have dry skin. this is very common. as far as the penis is concerned you should use a creme called man1 man oil. it is the best penis skin moisturizer around and will keep things in good shape down there. i've used it for years and i love it. good luck.
a rash is appearing all over my body. started upper arms then back now penis concerned because i had unprotected sex. concerned about hiv