What causes it?
While the exact cause isn’t known, IGH is strongly associated with:
Sun exposure over many years (it’s most common on sun-exposed skin)
Natural aging – the spots become more common as we get older
Genetics – some people are simply more prone to them
Is it harmful?
No. IGH is completely harmless. It doesn’t turn into skin cancer, doesn’t spread to other people, and doesn’t affect your overall health. It’s purely a cosmetic concern.
Other Possible Causes of White Spots
While IGH is the most common explanation, white spots can sometimes indicate other conditions:
1. Tinea Versicolor
This is a fungal infection caused by yeast that naturally lives on your skin. When it overgrows, it can cause:
White, pink, or tan patches
Often on the chest, back, and shoulders
More noticeable in summer (the yeast prevents tanning)
Treatment: Over-the-counter antifungal creams or shampoos often clear it up.
2. Vitiligo
An autoimmune condition where the immune system attacks pigment-producing cells (melanocytes):
Larger, irregular patches of complete pigment loss
Can appear anywhere on the body
Often symmetrical (appears on both sides)
May run in families
Treatment: Options include topical steroids, light therapy, and camouflage makeup. A dermatologist can help.
3. Post-Inflammatory Hypopigmentation
After an injury, rash, or inflammation, some people lose pigment in the affected area:
Follows a pattern of previous skin trauma
May gradually repigment over time
Common after eczema flares or minor injuries
4. Sunspots (Not the Kind You Think)
Ironically, sun damage can cause both dark spots and white spots. Some people develop white spots where sun exposure has destroyed pigment cells over time—essentially, tiny areas of sun damage.
Feature
IGH
Tinea Versicolor
Vitiligo
Size
Small (1-5mm)
Variable
Variable, often larger
Shape
Round/teardrop
Irregular patches
Irregular patches
Location
Sun-exposed areas (arms, legs)
Chest, back, shoulders
Anywhere, often symmetrical
Texture
Smooth
May be slightly scaly
Smooth
Age of onset
Usually after 40
Any age
Often starts young
Seasonal
Year-round
More noticeable in summer
Year-round
Can You Prevent or Treat IGH?
Since IGH is linked to sun exposure and aging, the best prevention is sun protection:
