“…3 In addition, endocrinological evaluation should be performed to rule out skin diseases associated with insulin resistance, such as acanthosis nigricans. 4 The differential diagnosis of TFFD includes acanthosis nigricans, confluent and reticular papillomatosis, tinea versicolor, 'dirty neck' lesions of atopic dermatitis, epidermal naevi, epidermolytic hyperkeratosis, granular parakeratosis and ichthyosis vulgaris. 5,6 Treatment for these conditions is similar to that prescribed for TFFD-swabbing with 70% …”