Contact urticaria to cow milk

Area of Science:

• Allergy and Immunology
• Dermatology
• Food Science

Background:

• Contact urticaria is a skin reaction triggered by direct contact with an allergen.
• Cow milk allergy is common, but contact sensitivity is less frequently documented.
• Investigating the role of heat treatment in reducing milk allergenicity is crucial for dietary management.

Observation:

• A patient presented with contact urticaria upon exposure to various forms of cow milk.
• Sensitivity was confirmed to whole milk, skim milk, condensed milk, and even milk heated to 80°C for 30 minutes.
• Specific milk proteins, casein and lactalbumin, were identified as allergens.

Findings:

• The patient exhibited persistent contact sensitivity to cow milk proteins even after heat denaturation.
• Unlike some previous findings, heat treatment did not eliminate the allergenic potential of milk for this individual.
• Both casein and lactalbumin were implicated as causative agents in the contact urticaria.

Implications:

• Heating milk may not be a universally effective method to reduce allergenicity for individuals with cow milk contact urticaria.
• Dietary recommendations for patients with milk contact sensitivity need careful individualization.
• Further research is needed to understand the mechanisms of heat-resistant milk allergens.