There is some dent and redness at the tip of my nose. How can this be reduced? (Photo)

Your photos are somewhat limited, however, we can see an area of redness by your right nostril margin at the columella. If you do not have rosacea, sometimes this can be nasal vestibulitis. That is simply skin irritation from a runny nose, and that may respond well to topical hydrocortisone cream. For a definitive answer, please consult with your otolaryngologist or dermatologist. Thank you. Sincerely, Dr. Joseph