Fears of this sort are not warranted. HIV is spread through sex or through injection of the virus through the skin into the blood stream. It is not spread by incidental cuts or scrapes and is not spread on inanimate objects such as pins or sharp edges. Transmission of the sort you mention has never been described. The virus does not survive well outside of the body so, even in the terribly unlikely circumstance that the pin that pricked you had pricked a person who had HIV earlier, you would not be at risk.
On the other hand, if you are scraping yourself frequently, you should be sure to keep the wounds clean so that they do not get infected and should make sure your tetanus immunization is up to date.
Take care. EWH
Dear Doctor, thanks for your reply and based on your 1st answer the virus already died soon so I'm not at any risk, I will do my best forget this experience and move on.
1. This varies depening on amount of blood, the temperature and other factors. HIV dies however quite quickly outside the body and, as I said, no one has ever gotten HIV through the sort of exposure you described.
2. No I meant the kind of infection that occurs from normal skin bacteria contaminating scrapes and cuts.
3. Th tetanus vaccine will prevent Tetanus, not HIV. They should be repeated every 10 years. EWH
Dear Doctor
Thanks for your earlier reply, just some clarities if you don't mind
1- how long does the virus survive outside the host ( one tiny drop of blood in a normal room temperature)
2- when you said I should keep the wound clean so I didn't get infected ( did you mean HIV infection)?
I just took Tetanus vaccine, do you think this will protect me in the future.
Thanking you