Laser hair reduction should never be performed over which of the following?

Laser hair reduction should not be performed over tattoos due to the potential for adverse reactions. The pigmentation within tattoos can absorb the laser energy in unexpected ways, which could lead to skin damage, burns, or discoloration. Additionally, the laser may not effectively target hair follicles in areas where tattoos are present, resulting in less effective hair reduction.

In contrast, while it is generally advisable to be cautious with procedures involving scabs, scars, or birthmarks, laser treatment can sometimes be performed around these areas, depending on the condition and advice from a qualified practitioner. However, the primary concern with tattoos involves the risk of an improper reaction to the laser, which makes this the most critical area to avoid when considering laser hair reduction.