Ulcers since last 2-3 years in mouth, a red patch in my tongue occurred 2 days ago, having lots of tiny red spots in tip and some cracks like in tongue.

Better to be seen by: Except for the ulcers, everything else may be normal occurrences. Without actually seeing what you are describing, we can't give you much more information. There are many different types of ulcers, each with different causes. If you want more information, you will have to see a dentist or physician for a better diagnosis.

Ulcers: "ulcers" can be caused by a variety of things. Using a regular toothpaste may have too much acid in it so it predisposes you to sensitivity by other food/drink acids such as tomato, orange, lemon, lime, pineapple etc. If these items are consumed before you go out in the sun then even more "ulcers" will occur. "cracks" in the tongue can be a normal genetic condition named fissured tongue.