<s>[INST] dark red spot on foreskin hi. I had in protected sex last night and this morning I noticed a dark red spot when I pull back my foreskin. I was wondering if this could be anything serious... any information would be grateful. I am going to book and appointment at the gu clinic but I am really worried about this.thanks for your help [/INST] HelloThanks for query. You have developed red spot on foreskin after having protected sex. This could be mostly due to allergic reaction to chemicals used as a lubricant in condom .However, even using condom is not considered to be 100 % safe and protected as there are chances of getting it broken which can be noticed during intercourse. Please get your basic screening tests for STD done to be rest assured about acquiring STD. Chat Doctor.  </s>