Contact dermatitis to Hirudoid cream.

Area of Science:

• Dermatology
• Allergology
• Contact dermatitis

Background:

• Hirudoid cream is a topical medication used for treating bruising and swelling.
• Allergic reactions to topical medications can be caused by active ingredients or excipients.
• Identifying the specific allergens is crucial for patient management and product formulation.

Purpose of the Study:

• To identify the specific ingredients in Hirudoid cream responsible for allergic contact dermatitis.
• To determine the prevalence of allergy to the cream base versus individual components.

Main Methods:

• Patch testing was performed on 31 patients with a known allergy to Hirudoid cream.
• Patients were tested with the complete Hirudoid cream, its base, and individual components.
• Reactions were assessed to determine sensitization to specific ingredients.

Main Results:

• 29 out of 31 patients (93.5%) showed allergic reactions to the cream base.
• 16 patients (51.6%) were allergic to one or more individual components.
• Myristyl alcohol, cetostearyl alcohol, and parabens were the most frequent allergens.
• 14 patients (45.2%) reacted exclusively to the cream base, suggesting base hypersensitivity.

Conclusions:

• The cream base of Hirudoid is a significant cause of allergic contact dermatitis.
• Hypersensitivity to common excipients like myristyl alcohol, cetostearyl alcohol, and parabens is prevalent.
• Further investigation into the safety and composition of topical cream bases is warranted.