I kissed may be hiv positive man who is having high viral load.. i also had canker sore on lips however it was not bleeding.how much risk is involved?

HIV and saliva risk : HIV is thought not to be transmitted by saliva . If your friend had bleeding, his blood could pose a risk, but your canker sores would not be expected to pick up the virus from his saliva alone . https://www.aids.gov/hiv-aids-basics/hiv-aids-101/how-you-get-hiv-aids/ Here's a reference on how you can and cannot get HIV. If you're healthy, make sure your partners are too !! Take care !! Get tested

Some: If you are worried get tested no matter how small the risk since timely treatment , if needed, makes a huge difference in disease progression.