Hello,
Thank you for your query at DoctorSpring.com
The specific concern that you mentioned regarding the possibility of getting HIV because of the use of a tweezer is a highly unlikely scenario. This is because the HIV is spread mainly by unprotected sexual encounters with someone who is HIV positive or sharing drug equipment such as needles with someone who has HIV. Also HIV positive blood (which cannot survive on a tweezer) has to be transmitted directly into your blood (through a break or tear in your skin for the possibility of HIV transmission to occur.
Also I would like to reassure you that the HIV virus does not survive long outside the human body (such as on surfaces), and it cannot reproduce. It is not spread by air or water, insects, saliva, tears, or sweat, casual contact like shaking hands or sharing dishes, closed-mouth or “social” kissing, toilet seats.
Hope this helps

Hello,
Thank you for the follow up.
I apologise I was under the impression that the bleeding appeared because the hair folicle had been pulled off forcefully resulting in a pin point bleed since this is pretty common while getting your eyebrows done with a tweezer.
Like I mentioned, even in the unlikely possibility that there was HIV positive blood on the tweezer the virus would not have been able to survive long enough to be transmitted into your body through a pore.
But to answer your direct question as to how much blood, a mmeasured quantity has not been ascertained. But even the small prick from a needle containing HIV blood can result in transmission, although the chances of that successful transmission is minute.
I would like to reassure you that the possibility of getting HIV specifically in the route that you have mentioned is highly unlikley. Hope this helps

Hello,
No an HIV test for this specific incident is not required.
Hope this helps. I look forward to your reply.

Thanks a lot for your appreciation.
Wish you great health!
Regards.