Back to Top Exams and Tests. Your health care provider can usually diagnose acanthosis nigricans by looking at your skin. A skin biopsy may be needed in unusual cases. If there is no clear cause of acanthosis nigricans, your doctor may order tests. This may include: 1  Blood tests to check blood sugar level.
The definition of unlike is a person or thing that is different from another. An example of unlike is a woman with short hair in a group of women with long hair. The definition of unlike is to withdraw your previously-posted expression of liking someone or something on a social media website. An example of unlike is to remove the like which you previously selected under a post from one of your friends on FaceBook. An example of unlike is to remove a television show which you previously had noted as one of your likes on FaceBook.
: to be very similar to but not exactly like (something) (chiefly Brit). : to do or make a thing that is very similar to but not exactly like (something).: to calculate the almost exact value or position of (something). to be very similar to but not exactly like (something) (chiefly Brit). : to do or make a thing that is very similar to but not exactly like (something).