Without either doing one of the following, nobody on this forum will be able to help you. Once you've finished either of the two let me know and I'll open the thread back up. With a question as vague as the one you've just asked, you may as well go onto a car repair forum and say "I turn the key, but the engine won't start - what's wrong?". There are lots of details that you've neglected, such as your current diet, exercise, alcohol consumtion, steroid intake (if any), etc etc etc.
1) Post several photographs of the affected area for discussion.
2) Visit a general practitioner.
3) Complete the above questions and include a photo.
Thanks much.