Bring your color history, not just a reference photo
The American Academy of Dermatology explains that major lightening can damage hair and recommends care when coloring or perming. Its guidance also addresses reactions to store-bought dye and protecting treated hair from sun exposure.
Tell your stylist about previous dye, bleach, and chemical treatments before discussing the target shade. Ask what is realistic now, whether the change needs several visits, and what upkeep will cost. For a suspected reaction or a scalp concern, seek a dermatologist's advice rather than treating a salon consultation as medical care.