Hello
Transmission of
HIV infection through intact skin has not been documented In your case your middle finger entrapped with dried blood of that patient , who were lying on the scan before you ( HIV patient ) .
Although , that patient died due to HIV so more virulent strain were present including advanced-stage disease.
Large multi-institutional studies have indicated that the risk of HIV transmission following skin PUNCTURE from a needle or a sharp object that was contaminated with blood from a person with documented HIV infection is ~0.3 % and after
mucous membrane exposure it is 0.09%( but in your case your skin was not punctured but blood was dried and contacted with your middle finger , so in that sense there is remote chance of getting HIV infection by you ).
Neither your skin puncture , rather it was INTACT but as you mentioned that you scratched your pimple on face but in this way also , no chance getting HIV infection because blood was dried and scratching was NOT DEEP .
In VIRTO i.e. outside in the air can't survive . The HIV require blood that too in large quantity .
Since , all tests are NEGATIVE & fact is also this ,but you are in great tension , so it will be the best get in
ELISA test after 3 months and 6 months for HIV confirmation.
In my point of view , you are HIV free.
Good luck.