<s>[INST] I had sex last night with my ex gf and when I woke up to go to the bathroom I had small circular red dots on the head of my penis and down the shaft. Looks very rash like. This has never happen before. They are very small and circular with no discharge or anything like that. [/INST] HelloThanks for query. Red spots on glans penis post sex are mostly due to either allergic reaction to chemicals used as lubricant in condom if it was a protected sex r due to acidic vaginal secretion of your female partner in case of unprotected sex. Take antibiotic like doxycycline nice daily. Ensure to wash your genital with warm water twice daily. Ensure to avoid sexual encounters till it gets cured completely. Chat Doctor.  </s>