Please suggest what type of mouth sore might I experience as a symptom of hiv?

Why do you ask? Mouth sores are common. Most people are familiar either with the herpes simplex fever blister or the annoying white canker sore in the mouth from a local vasculitis. Neither indicates hiv, though lots of troublesome canker sores warns of neutropenia, lupus, or behcet's. Other sores should be seen. If you've asked and are worried about your HIV status, you owe it to yourself to be tested.