The evaluation of contact dermatitis begins with a medical history and physical examination.

Physical findings in those with contact dermatitis include:

• Skin redness
• Skin scaling
• Skin peeling and crusting
• Rash
• Raised skin lesions that appear blister-like or ooze are also not uncommon.
• Raised skin lesions with irregular borders (hives)

The diagnosis of contact dermatitis may be confirmed through testing.

Tests that may be used to evaluate contact dermatitis may include:

• Allergy skin testing
• Skin biopsy:
• A sample of skin is collected for examination under a microscope