Unfortunately, white freckles can't really be treated. Like most damage caused or worsened by the sun, prevention is your best bet. "It's hard to avoid them, if you have a genetic predisposition to get them, but regular SPF 30 to 50 and avoidance of excessive sun exposure is certainly recommended and may lower the risk of developing these," Stefanie Williams, a dermatologist and medical director of EUDELO Dermatology & Skin Wellbeing, told Yahoo! Life.

If you want to reduce the appearance of white freckles for cosmetic reasons, Diakow suggests you try cryotherapy, intralesional steroid injections, topical retinoids, or chemical peels or lasers, though results differ person to person. However, it's worth noting that not all cases of white freckles on your arms are considered to be IGH. "Other possible causes of white spots on the skin include fungal infection, autoimmune conditions, and post-inflammatory hypopigmentation," Diakow explained. If you have any concerns, seek out help and find a medical professional who can diagnose them.