I went for a party and lady bite on my chest . I did a ELFA test 4th generation. Am i at risk?
Thank you for your inquiry. From what we gather from the question, you were asking about acquiring HIV from a bite on your chest with a pimple. From the information given, this scenario is determined to be negligible risk. This risk level presents a potential for HIV transmission because they do involve the exchange of body fluids. However, there has never been a confirmed report.
For a risk to exists, specific HIV positive fluids (semen, pre-cum, vaginal fluid, rectal fluid) must come into direct contact with the blood stream of an HIV negative person. Most of the body's surfaces are "dry" skin and they don't allow HIV to enter the body. "Wet" skin (or mucous membranes) is more vulnerable to HIV and these include foreskin and urethra in penis, cervix, vagina, anus, rectum, mouth, throat, open cuts and sores. 
Recommendation: There are no evidence or no documented cases of transmission refer to a Physician for more personalized answers.
Regards, AIDS Vancouver Helpline/Online, Ashley