Red mark on my nose after septorhinoplasty, what could it be?

This red rash looking mark or splodge of pink has developed after the cast off my nose is two months post opp it gets bigger one day and the next swelling goes down. I also have developed a hole like dip at the tip of my right nostril. It was open surgery. What could the red mark be, will it stay? And what could have caused this dip?