This single-center prospective randomized parallel-group trial compares laser ablation and crystallized phenol application in adults with primary uncomplicated sacrococcygeal pilonidal sinus disease. The primary objective is to compare postoperative day 1 pain intensity between the two treatment methods. Secondary objectives include complete epithelialization by day 30, time to complete epithelialization, postoperative day 7 pain, duration of analgesic use, time to return to daily activities and work, early local complications, and 6-month recurrence.