Dermatitis affected about 10% of . workers in 2010, representing over 15 million workers with dermatitis. Prevalence rates were higher among females than among males, and among those with some college education or a college degree compared to those with a high school diploma or less. Workers employed in healthcare and social assistance industries and life, physical, and social science occupations had the highest rates of reported dermatitis. About 6% of dermatitis cases among . workers were attributed to work by a healthcare professional, indicating that the prevalence rate of work-related dermatitis among workers was at least %. 
A skin biopsy (a sample of a small piece of skin that is sent to the lab for examination under the microscope) is rarely helpful to establish the diagnosis. Many patients with severe atopic disease may have elevated numbers of a certain type of white blood cells (eosinophils) and/or elevated serum IgE level. These tests can support the diagnosis of atopic dermatitis. Additionally, skin swab (long cotton tip applicator or Q-tip) samples may be sent to the lab to exclude staphylococcal infections of the skin, which may complicate atopic dermatitis.