What causes a reddish stain on penis after masturbation?
Patient: Hi! Yesterday after taking care of myself after two days (mastubating, 3 times) I suddenley noticed I had a dark redish/violet stain like on my penis skin (shaft?). It's not painful and I'm not sure if it got better from yesterday or remained the same. Am just a little worried, can you help? Doctor: HI,   It can be due to urinary tract infection, if spot is present on the nerve, it can be due to ischaemic condition. You can take penis doppler to detect if any disease condition is produced.  Hope I have answered your query. Let me know if I can assist you further.  Take care  Regards, Dr S.R.Raveendran, Sexologist