What does it mean if a cold plaster feels hot and burning when applied?

Generally, a burning sensation after applying a cold compress medicated patch may be caused by skin adaptation to irritation, penetration of the patch's ingredients, damaged skin barrier, contact dermatitis, or acute eczema. It is recommended to seek medical advice promptly, identify the underlying cause, and receive appropriate treatment under a doctor's guidance. Specific causes are analyzed as follows:

1. Skin adaptation to irritation: Cold compress patches contain cooling ingredients that may cause a brief stinging sensation upon initial contact, especially in individuals with sensitive skin. Try applying on a small area first. If the irritation gradually subsides without other discomfort, continued use is acceptable, provided each application does not exceed 8 hours.

2. Penetration of patch ingredients: As active ingredients in the patch penetrate through the skin, they may mildly stimulate local nerves, causing a burning sensation. Clean and dry the skin before application, and avoid hairy areas to reduce resistance to ingredient absorption. Discontinue immediately if the burning sensation intensifies.

3. Damaged skin barrier: When the skin has minor breaks, dryness, or flaking, ingredients from the patch can easily irritate the dermis, leading to discomfort. Stop using the patch, gently cleanse the area with lukewarm water, and apply vitamin E ointment. Wait until the skin is fully healed before reapplying, and maintain regular skin moisturization.

4. Contact dermatitis: Allergic reactions to the adhesive tape or medicinal components in the patch can cause redness, burning, and itching. Follow your doctor’s instructions to use medications such as calamine lotion, desonide cream, or hydrocortisone butyrate cream. Avoid scratching and refrain from using similar patches in the future.

5. Acute phase of eczema: In patients with eczema, the skin is already hypersensitive; applying a patch can worsen inflammation, resulting in a burning sensation accompanied by oozing and itching. Follow medical advice to use topical treatments such as mometasone furoate cream, tacrolimus ointment, or pimecrolimus cream. Keep the affected area well-ventilated and avoid moisture.

Before using medicated patches in daily life, inspect the skin condition to ensure there are no wounds or signs of inflammation. Immediately discontinue use and clean the area if blisters, ulceration, or other adverse reactions occur. Store patches away from light and moisture to prevent ingredient degradation and potential skin issues.