I have seen a sort disformation on wall of my room I have attached snapshot of both inside view(from inside room) and out side view(that is out of room)
The wall is experiencing rising damp.
Basically, moisture in the soil is being absorbed by the wall and traveling up the wall. This can become more prevalent during wet periods and subside during dry periods.
The photograph of the outside of the wall appears to show a of line salt crystallizing towards the top of the affected zone. This is not unusual as the rising ground water brings any salt that is within the ground into the wall. As the moisture in the wall evaporates, salt crystallizes on the wall. Over time this can damage the wall. If the wall is made of bricks, it can cause the bricks to crumble.
During construction of the wall, a damp course should have been incorporated into the wall. This is a waterproof layer which prevents ground moisture from rising into the wall above the damp course.