What Is The Cause Of Dark Spots Near Clitoris And What Is The Treatment?

Hi. I have 2 dark spots near may clitoris. It's flat and also painless. I'm 28 and I jast had anal sex for about 4 or 5 times last year. however I am masturbating by rubbing clitories for 4 years at least twice a month. I am really worried about these spots. They have been permanent for more than 2 years. I tried to quit masterbation in case they disappear but nothing happened. Can you tell me what is the reoson of these spots and what should I do?
I have another question too. Did anal sex damage my hymen? I'm single and I'm afraid of going to the doctor because of religious matters. Please help me. I'm really really worried.