Description: Hyperkeratosis with acanthosis and hyperpigmentation No increase in melanocytes

History:

 This man presented for a skin check. He was noted to have a lesion on his calf with eccentric hyperpigmentation which on high power view showed some dots as lines and a structureless picture elsewhere. Pigmented IEC was suspected but it was a seborrhoeic keratosis on histology.

See the initial part of this video for a discussion of the histology.