There is now a large bright light under and to the left of Antares. Not a star or planet. What is it?

In the last few weeks we have noticed a large bright light under and to the left of Antares in the Scorpio Constellation. If a star, it has never been there before; if a planet, why is it not moving to the left upon its planetary path? What is it? I am observing from the Southern Hemisphere in South Africa.