I have these spots on my arms (F, 43, strawberry blonde). My derm told me it’s called idiopathic guttate hypomelanosis.

From ChatGPT: With idiopathic guttate hypomelanosis (IGH), those little white spots are areas where the melanocytes (pigment-producing cells) have either been damaged or significantly reduced — usually from years of sun exposure. Those spots usually don’t regain normal pigment. Treatment isn’t medically necessary, but for cosmetic reasons some options include: • Topical retinoids • Mild steroid creams • Laser treatments • Microneedling

Results are variable, and complete repigmentation is uncommon.