Help!! What could this be?

I remember having this spot for a long time but it was really small, it has become bigger for at least 6 months. Now I have white hairs and around 1/3 of the normal amount of hairs in this spot. What could this be? Has someone had something similar?

https://preview.redd.it/aeebkvrq4yd91.jpg?width=2448&format=pjpg&auto=webp&s=8ff658bb7ca6479c27fa73c1f3b133769b989c4d