 [ Symptoms ] rash on lower back h i have had a rash on my lower back for a few months now that will not go away it is on the top of my buttocks to be precise it is somewhat itchy whenever i am sweatingworking out but does not cause pain i am worried it may be an std but i have not had any type of sexual intercourse since august 2015 any help is well appreciated thank you [ Disease ] there are more than 4 000 chemicals in cigarette smoke some of them are also in wood varnish the insect poison ddt arsenic nail polish remover and rat poison the ashes tar gases and other poisons in cigarettes harm your body over time they damage your heart and lungs they also make it harder for you to taste and smell things and fight infections