As your summer tan fades, you may notice tiny white spots on your arms or legs that stand out against darker skin. While they can look alarming, these marks are usually harmless. Many people fear they signal a serious illness or infection, but doctors say they are commonly known as **”idiopathic guttate hypomelanosis—or IGH for short.”** Despite the complicated name, the condition is **”entirely harmless, non-contagious, and remarkably common.”**

IGH appears as small, smooth white patches caused by a loss of melanin, the pigment that gives skin its color. These spots are most common on areas exposed to the sun, such as the arms, legs, and sometimes the face. Experts estimate that **”between 50% and 80% of all adults over the age of forty”** will develop at least a few. Rather than indicating disease, dermatologists consider them a normal part of aging.

The main cause is years of sun exposure. Over time, UV rays damage the skin’s pigment-producing cells, leaving small areas unable to tan. Although the spots become more noticeable with age, they **”pose zero threat to your physical health and never indicate a severe underlying disease.”**

Many people search for treatments, but there is **”no medically proven cure or permanent treatment”** for IGH. Expensive options like lasers, chemical peels, or creams rarely restore lost pigment. IGH is also often mistaken for fungal infections, but unlike fungal patches, these spots are usually smooth, dry, and not itchy. If they change rapidly, itch, or spread unusually fast, you should see a doctor.

Although IGH cannot be removed permanently, you can reduce its appearance with body makeup, gradual self-tanner, and daily sunscreen to help prevent new spots. Keeping skin moisturized also improves its appearance. Most importantly, remember these white spots are a common sign of aging and years spent in the sun—not a sign of disease.