White spots on the skin can have several different causes. The appearance, location, and whether they’re itchy or changing can help narrow it down. Some common possibilities include:
- Vitiligo: Smooth, well-defined white patches caused by loss of pigment. They often appear on the hands, face, around the eyes or mouth, elbows, knees, or genitals. They usually are not itchy.
- Tinea versicolor: A common fungal infection that causes lighter (or sometimes darker) patches, often on the chest, back, shoulders, or neck. The patches may have fine scaling and can be mildly itchy.
- Post-inflammatory hypopigmentation: Light spots that appear after eczema, psoriasis, burns, insect bites, or other skin injuries. These often gradually regain color over time.
- Idiopathic guttate hypomelanosis: Small, round white spots that commonly develop on the arms and legs of adults, especially with age and sun exposure.
- Pityriasis alba: Pale, slightly scaly patches, often on the faces of children and young adults.
A healthcare professional, such as a primary care clinician or dermatologist, can often distinguish these by examining your skin and, if needed, using a special light or performing a simple skin scraping.
You should seek prompt medical evaluation if:
- The white patches are spreading rapidly.
- They are associated with severe pain, blisters, or signs of infection.
- You have unexplained weight loss, fever, or other concerning symptoms.
- The spots developed after a new medication or a significant chemical exposure.
To help identify the cause, could you tell me:
- Where on your body are the white spots?
- How long have you had them, and are they spreading?
- Are they itchy, scaly, painful, or completely smooth?
- Approximately how old are you?
- If possible, could you upload a clear photo in good lighting? I can help describe what it most closely resembles, though I can’t make a definite diagnosis from an image alone.