Nobody has to know why you are going. Your visit is private and confidential. Clinic staff will not discuss your condition with anybody. College clinics understand that young adults need access to care without involving their parents. Nobody will contact your parents without your permission.
Most young adults are healthy and have little experience seeking medical care.
What you and many young adults need to understand is that medical afflictions of private areas of the body may be embarrassing for you, but the doctors have dealt with a variety of private parts many time. Do not let embarrassment prevent you from getting the care you need. About four months ago he started getting a flaky scalp similar to what cradle cap looks like but it didn't go away. I took him to the doctor for a day care check up and the doctor said to wash his hair with a tar shampoo. We've been doing this since about every other day.