Hi im 38 , 5 foot 9 and 10 1/2 stone.... i recently had unprotected sex in may this year and every thing has been fine , until 2 weeks ago the tip of my penis became red / tender only every now and then .. but last night the head of the penis got a rash all over slightly raised non itchy and painless , i washed it and went to bed and in the morning rash had got slightly but the head looked off colour and as i rubbed over the head with my thumb white stuff like smegma was appearing , could this be signs of an std or fungel infection ??