<s>[INST] I was recently told I had a yeast infection and to take an over the counter treatment. After 7 days with no results, I felt like it was getting worse. I talked again with my doctor and got an examination. I still had a yeast infection. I was prescribed pills. Now another week has passed and I started my period and still have signs of a yeast infection, but now it s accompanied by thick black blood. What is wrong with me? [/INST] Hello, Thank you for your contact to Chat Doctor. I understand your concern. If I am your doctor I suggest you yeast infection never causes such an infection that causes black blood. Brown or clotted blood occasionally is normal. Your frequent yeast infection requires detail history for primary cause for it. I suggest you should be investigated for the culture and sensitivity of the yeast and treatment according to it. I will be happy to answer your further concerned can contact me. Chat Doctor. Infectious disease specialist. Thank you. </s>