Idiopathic Guttate Hypomelanosis (IGH): Understanding Tiny White Skin Spots
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
Idiopathic guttate hypomelanosis (IGH) is a benign, very common skin condition that causes small, light-colored spots, most often on the forearms and shins. The spots aren't itchy or painful, and their number increases with age. The cause is unknown but may involve sun exposure and aging. No treatment is required, though creams and procedures such as cryotherapy are options. [1]
What the research says
Many treatments seem to work, but the evidence is limited. A 2025 systematic review screened 522 articles and included 20 studies of IGH treatments (9 randomized and 11 quasi-experimental), enrolling between 6 and 240 patients each. The authors concluded that a wide range of interventions are effective and that most involve some form of therapeutic wounding. However, half of the randomized studies had a high risk of bias, outcome measures varied, and large randomized trials with long-term follow-up on how long repigmentation lasts are lacking. (Aravindakshan et al., Clin Exp Dermatol, 2025)
IGH is a clinical diagnosis with no standard therapy. A clinical review describes IGH as a benign, usually symptom-free acquired leukoderma that affects mature individuals, with chronic sun exposure and aging as important triggers. It is diagnosed by examination, with dermoscopy and histopathology as aids in questionable cases, and patients often seek cosmetic treatment even though there is no standard therapy. (Buch et al., J Cosmet Laser Ther, 2021)
What is idiopathic guttate hypomelanosis (IGH)?
Idiopathic guttate hypomelanosis (IGH) is a noncancerous, very common skin condition that causes small, light-colored spots scattered across the skin. It is noncancerous and very common. [1] The long name describes the condition piece by piece:
The spots (macules) tend to appear on sun-exposed areas such as your forearms and shins, and IGH affects people of all skin colors. IGH isn't harmful to your health, but it can change your appearance, which may affect self-esteem. [1]
What are the symptoms of IGH, and what do the spots look like?
IGH doesn't cause any symptoms other than light spots on your skin. The spots aren't itchy or painful. [1]
Feature | Description |
Color | Lighter than the surrounding skin, or completely white. [1] |
Location | Forearms and shins are the most common. Less often, the face, neck or trunk. [1] |
Shape | Most are round or oval with irregular edges. [1] |
Size | Usually smaller than a pea, but some can be as large as a quarter. [1] |
Texture | Most often smooth. Rarely, they can be thick or scaly. [1] |
Number over time | The number of macules increases with age, and some people have over 100 spots. They usually stay the same size. [1] |
What causes idiopathic guttate hypomelanosis (IGH) and who is at risk?
A decrease in melanin, the pigment that gives your skin its color, causes IGH. Researchers don't know why this happens, but they think a combination of factors may contribute: [1]
Sun exposure
Aging
Genetics
Tiny cuts in the skin (microtrauma), such as from using body scrubs
There's nothing you can do to prevent IGH. [1]
How is idiopathic guttate hypomelanosis (IGH) diagnosed?
A healthcare provider can typically diagnose IGH by looking at the spots on your skin. They may also use a small, handheld microscope that magnifies the skin (a dermatoscope), which can help tell IGH apart from other skin conditions. [1]
See a healthcare provider if you notice any changes in your skin. They can rule out more serious conditions such as vitiligo or skin cancer. [1]
What are the treatment options for idiopathic guttate hypomelanosis (IGH)?
IGH doesn't need treatment because it isn't harmful to your health. But you may choose treatment if you don't like how the light spots look. There are two main medical options, topical creams or procedures. The effectiveness of each varies, though most show good outcomes. [1] Your healthcare provider can explain the pros and cons of each.
Topical creams
Topical creams are the least invasive treatments. They may contain steroids, retinoids or immune-suppressing medicines called calcineurin inhibitors, which help increase the production of melanin in your skin. [1]
Procedures
Procedures rely on your skin's ability to heal itself. They remove or damage the upper layers of your skin, and as it heals, your skin produces new cells with normal pigmentation. [1]
Chemical peel: a chemical solution removes the outer layers of skin.
Cryotherapy: a very cold liquid destroys the upper skin layers.
Dermabrasion: the outer skin layers are sanded down.
Laser treatment: pulses of energy destroy the top layers of skin.
Microneedling: Cleveland Clinic describes a tattoo machine being used to inject a chemotherapy drug into the skin.
Natural remedies
You may find information online about natural remedies such as apple cider vinegar, aloe vera and ginger. There aren't any scientific studies showing these remedies work, so talk to your provider before using any natural products to treat IGH. [1]
Frequently Asked Questions
Is IGH contagious?
No. IGH isn't an infection. It is caused by a decrease in melanin, the pigment that gives skin its color.
How is IGH different from vitiligo?
IGH spots are usually small (typically smaller than a pea) and appear mostly on sun-exposed areas such as the forearms and shins. Vitiligo often causes larger patches that can appear anywhere on the body. Only a healthcare provider can tell the two apart for sure.
Will IGH turn into skin cancer?
IGH is noncancerous (benign). Because more serious conditions such as skin cancer can look different, have any new or changing spot checked by a healthcare provider.
Can I use a tanning bed to hide the spots?
Using a tanning bed is not a good idea. Tanning beds add UV exposure, which raises skin cancer risk, and sun exposure is a suspected contributor to IGH. Darker surrounding skin can also make pale spots stand out more.
Are there natural remedies for IGH?
Apple cider vinegar, aloe vera and ginger are often mentioned online, but there aren't any scientific studies showing these remedies work. Talk to your provider before trying them.
Does IGH cause pain or itching?
No. IGH doesn't cause any symptoms other than light spots, and the spots aren't itchy or painful.
Can children get IGH?
IGH is characteristically seen in mature individuals, and the number of spots increases with age. If a child develops new white patches, have a healthcare provider check them to find the cause.
Can sunscreen prevent IGH?
Cleveland Clinic says there's nothing you can do to prevent IGH. Sun exposure may contribute, so sun protection is still good for overall skin health, but it isn't a proven way to prevent the spots.
Do the spots grow larger over time?
The spots usually stay the same size. What changes is the number of spots, which increases with age.
Does IGH need treatment?
No. It isn't harmful to your health. You can choose treatment if you don't like the appearance of the spots.
What is a macule?
A macule is a flat, distinct area of skin that differs in color from the skin around it. IGH spots are macules.
Can IGH appear on the face?
Yes. The forearms and shins are the most common locations, but spots can also appear on the face, neck or trunk.
Why are the spots called "guttate"?
Guttate means markings that resemble drops, which describes the small, drop-like shape of the spots.
How is IGH diagnosed?
A healthcare provider can usually diagnose it by looking at the spots. They may use a small, handheld microscope that magnifies the skin to help tell it apart from other skin conditions.
When should I see a healthcare provider about white spots?
Talk to a provider if you notice any changes in your skin. They can rule out more serious conditions such as vitiligo or skin cancer, and discuss treatment if you want it.
Related Reading
Tinea Versicolor: Complete Guide to Symptoms, Causes, and Treatment covers a common fungal rash that can cause light skin patches.
Pityriasis Alba: Understanding Childhood Skin Patches explains pale, scaly skin patches that often appear in children.
Age Spots (Liver Spots): Complete Guide to Causes, Treatment & Prevention covers sun-related skin spots and how to prevent and treat them.
Cryotherapy: Uses, Procedure, Risks and Recovery describes how freezing treatment is used on skin spots and lesions.
References
Cleveland Clinic. Idiopathic Guttate Hypomelanosis (IGH). Cleveland Clinic. Last updated January 12, 2026. https://my.clevelandclinic.org/health/diseases/idiopathic-guttate-hypomelanosis
Aravindakshan R, et al. A systematic review of interventions for idiopathic guttate hypomelanosis. Clin Exp Dermatol. 2025;50(9):1741-1747. PMID 40192523. https://doi.org/10.1093/ced/llaf134
Buch J, et al. Idiopathic guttate hypomelanosis: Presentation and Management. J Cosmet Laser Ther. 2021;23(1-2):8-15. PMID 34304679. https://doi.org/10.1080/14764172.2021.1957116
Medical disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. If you think you may have a medical emergency, call your doctor or 911 immediately.
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