Which phase is active and most effective for laser hair removal?

• A. Catagen
• B. Exogen
• C. Anagen
• D. Telogen

Answer: (C)

The most effective phase for laser hair removal is the active growth phase, known as anagen. In anagen, the hair follicle is actively growing and tightly connected to a rich blood supply, with the hair containing melanin that can absorb the laser light. This allows the laser energy to heat and damage the follicle, reducing future growth. Other phases are less favorable: catagen is a short transition when the follicle is shrinking and less attached; exogen is shedding; and telogen is a resting phase with little activity and pigment exposure, making laser energy less effective.