Hello!
I read carefully your query and understand your concern.
Since you had
unprotected oral sex and you are not sure of your partner
HIV status,exist the possibility that you might have been exposed to HIV.
Depending on the phase of the infection, symptoms of HIV can vary. Initially, most people who contract the illness experience common flu-like symptoms that may be hard to distinguish from a more general flu or a gastrointestinal or respiratory infection. This first stage of HIV is known as acute or primary HIV infection.
Primary HIV infection is followed by a chronic or latent phase, that can last up to 10 years.Many people show no symptoms of HIV infection during this entire period.
When the immune system is very weak than opportunistic infections start to appear frequently and this is called
AIDS stage.
In my opinion this
back rash is not related to HIV infection but since there is a chance that you might have been exposed to HIV I suggest to get tested for HIV.
You can do Antibody test (Rapid test) which is very easy to do(just a finger prick) and you can get the result the same day of the test.
I suggest you should consult a physician because physical examination is very important to determine the cause of this rash.
Hope my answer has helped.
Take care.
Dr.Rovena