<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello, I have my penis glans blue in color it look like it have poor blood circulation. I also feel numbness followed by vibration like sensation jinjini. When it erect glans turns again in normal red color but again in normal size it turns to dark blue in color.  <response>: Degree understand your concerns went through your details. Please do not worry about those things. Hard black blue is normally the color of penis in tropical region people. There are other symptoms for the problem you are suggesting. Please consult a physician for evaluation and diagnosis. Worrying is of no use. If you still need my assistance in this regard, please use this link. Please remember to describe the whole problem with full detail. Hope this answers your query. Available for further clarifications. Good luck. 