Google the keywords from your question and pick up the related sites. There are many forums and websites where doctors reply to your questions. All the best.
The most common place is Web MD, but there are other sites as well. You have The Doctor's Lounge and many many more. A quick search will give you a very long list of places you can ask questions and get a response from a wide range of doctors.
It's best to ask a doctor in person or call a doctors office because with these online ask a doctor question websites you never know if you're taking to a real doctor or if you're just talking to some John Doe who is paid to answer your questions.
There are a few good websites that you can go to (WEBMD), but to actually chat they will charge you and most doctors can't diagnose a problem without seeing you.
There are many places you can go to ask a doctor questions. The ones I have found are sites you have to pay for an answer from a doctor. There are also places on the web you can go and find general information for free such as WebMD or .
It's always recommended that you go to an actual doctor before asking on the internet, but if you're inclined to do so, you can check out the Doctors Lounge website, which you can find on google.
