Is Your Heating Pad the Culprit of Your Hyperpigmentation?

Erythema ab igne is a skin condition caused by repeated exposure to heat, resulting in a net-like or mottled discoloration of the skin. While often benign, it reflects chronic thermal injury and should be evaluated if persistent.

What Causes Erythema Ab Igne?

This condition develops from prolonged exposure to moderate heat sources, including:

• Heating pads

• Laptop computers

• Space heaters

• Heated car seats

• Hot water bottles

The heat is typically not strong enough to cause a burn, but repeated exposure damages superficial blood vessels and pigment-producing cells over time.

Common Symptoms

Erythema ab igne often appears as:

• Lace-like or reticulated redness

• Pink, brown, or violaceous discoloration

• Most commonly on the thighs, lower back, abdomen, or shins

Early changes may fade with time, but continued exposure can lead to permanent pigmentation.

Is Erythema Ab Igne Dangerous?

Most cases are benign. However, long-standing erythema ab igne can increase the risk of skin cancer, including squamous cell carcinoma, within the affected area. Any persistent, changing, or thickened skin should be evaluated by a dermatologist.

Treatment Options

The most important step is eliminating the heat source. Additional treatments may include:

• Topical retinoids

• Pigment-lightening agents

• Laser or light-based therapies

• Monitoring or biopsy if changes are concerning

Treatment options depend on duration, severity and skin type.

Prevention Tips

• Avoid placing heat sources directly on the skin

• Use heating devices intermittently and with a barrier

• Be mindful of low-grade heat exposure over time

When to See a Dermatologist

Schedule an evaluation if discoloration persists, worsens, or changes in texture, or if the diagnosis is uncertain.

Expert Dermatologic Care

At Boutik, we take a thoughtful approach to diagnosing and treating heat-related skin changes, focusing on both prevention and long-term skin health.