The evaluation of seborrheic keratosis begins with a history and physical examination.

Physical findings in someone with seborrheic keratosis include one or more skin lesions that are:

• Tan, brown, or black
• On the trunk, face or hands
• Greasy or waxy in appearance
• Round or oval
• Raised:
• May appear stuck on the skin
• Sharp edges with well-defined borders
• Numbers of lesions increase with age

Usually, tests are not necessary to make the diagnosis of seborrheic keratosis.

Tests that may be used to evaluate seborrheic keratosis include:

• Skin biopsy