Unfortunately I have had it on my forehead many other areas.

I have had them on my forehead. Now on both sides of my face, nose, & bilateral upper arms.
Also, on upper back and on my scalp at the back of my neck.
When my face was very bad I would not leave my house. I looked like I had Leprosy!

I have a big one on my forehead

It can happen anywhere on the body, I believe. Many of us have them in many spots, unfortunately. For instance, I have a new one starting on my nose... Maybe I'll be a bonafide witch lookalike! Lol