What should I do if my skin itches after applying a medicated plaster?

Plasters are traditional Chinese medicinal external preparations made by boiling herbal ingredients in plant or animal oil to form a gel-like substance, which is then applied to one side of cloth, paper, or leather. They can be affixed to the affected area for an extended period and are primarily used to treat conditions such as boils, carbuncles, swelling, and pain. So, what should you do if your skin itches after applying a plaster? Below, we address this question.

What to Do If Your Skin Itches After Applying a Plaster

Itching after plaster application is commonly due to contact dermatitis, typically presenting with well-demarcated erythema, papules, vesicles, erosion, and exudation. In such cases, plaster use should be discontinued immediately. Under medical guidance, topical corticosteroid ointments—such as desonide cream or compound flumetasone ointment—may be applied to alleviate symptoms. If erythema and vesicles predominate, topical corticosteroids combined with oral antihistamines (e.g., cetirizine or loratadine) may be prescribed. However, all medications must be used strictly under physician supervision to avoid adverse reactions. Additionally, because plasters have poor breathability, prolonged application may easily cause pruritus or allergic reactions—and even erythematous rashes. For open or ulcerated wounds, plaster application time should be reduced to 5–6 hours; residual medication residue on the skin surface should be gently removed, allowing the skin to rest for 1–2 hours before reapplying a fresh plaster.

Knowledge Extension: Key Precautions When Using Plasters

1. Pay Attention to Application Site

Plasters should not be applied to the head or face—especially near the mouth, nose, or eyes—if pain is present in these areas. Moreover, if the intended site has abundant body hair, hair should be shaved prior to application to ensure optimal drug absorption and efficacy.

2. Avoid Use in Individuals with Allergic Constitutions

If itching, burning, or stinging occurs at the application site, the plaster should be promptly removed, as these symptoms often indicate an allergic reaction to the plaster. Alternative treatment modalities should be considered to relieve pain; continued plaster use is contraindicated.

3. Avoid Use on Damaged or Broken Skin

Plasters must not be applied over areas with skin injury, abrasions, or ulcers, as this may increase infection risk. Prior to application, the affected area should be gently cleansed with warm water and thoroughly dried to optimize therapeutic efficacy.

The above outlines appropriate management strategies for skin itching following plaster application. We hope this information proves helpful.