White spots on the skin that appear or become more noticeable in summer are fairly common, and there are several possible causes. A dermatologist would usually look at the appearance, location, texture, and whether the spots are spreading or changing before making a diagnosis.
Common causes include:
1. Sun-related white patches (pityriasis alba)
- Often appears as light, slightly dry patches, especially on the face, arms, or shoulders.
- The contrast becomes stronger after surrounding skin tans.
- More common in children and young adults but can occur at any age.
- Treatment: Moisturizers, gentle skincare, and sunscreen. Mild cases often improve over time.
2. Sun damage-related spots (idiopathic guttate hypomelanosis)
- Small, flat white dots, often on the arms, legs, and sun-exposed areas.
- More common with increasing age.
- Treatment: Usually harmless and may not require treatment. Dermatologists may offer options such as topical treatments or procedures if appearance is a concern.
3. Fungal infection (tinea versicolor)
- Caused by an overgrowth of a normal skin yeast.
- Can cause lighter (or sometimes darker) patches, often on the chest, back, shoulders, or neck.
- May have mild scaling or itching.
- Treatment: Antifungal creams, washes, or medications recommended by a healthcare professional.
4. Vitiligo
- An autoimmune condition where pigment-producing cells are affected.
- Causes sharply defined white patches that can enlarge over time.
- Treatment: Options may include prescription creams, light therapy, or other treatments from a dermatologist.
What you can do now
- Use broad-spectrum sunscreen to reduce contrast between normal skin and lighter areas.
- Moisturize dry or rough patches.
- Avoid harsh scrubbing or unproven “bleaching” remedies.
- Avoid using steroid or antifungal creams without knowing the cause.
See a dermatologist if:
- The spots are spreading quickly.
- They are completely white with clear borders.
- They involve the lips, eyes, or genital area.
- There is itching, scaling, pain, or hair turning white in the affected area.
- They appeared suddenly and you are unsure of the cause.
If you describe the spots (where they are, their size, whether they are smooth or scaly, and your age), I can help narrow down the most likely causes.
