Dark skin tags on forehead

Patient: How can i treat these dark patches on my forehead?At an early age when i was 13 years old these thick dark patches started appearing on my forehead. I believed it was regular acne but I’ve done some research and i’ve come to conclusion that it wasn’t. Everytime I scrape of the skin it feels smooth. Kinda looks like Seborrheic Keratosis but rather thin.

Symptoms: No symptoms whatsoever