Previous punch biopsy was attempted but didn't go deep enough (that's why there is a dermal scar over the lesion). Excision was performed to remove lesion and obtain enough tissue for diagnosis.

For case 8 diagnosis, click here: https://kikoxp.com/posts/7942
Video explaining how to distinguish it from its mimic: https://kikoxp.com/posts/9641


Recording of my virtual slide session for the Emory University dermatology residents on 12.17.2020.
Clinical history and WSI digital slides for each case:
Case 1. 60 yo woman with nodule on elbow. https://kikoxp.com/posts/3741
Case 2. 12 yo girl with nodule on dorsal finger. https://kikoxp.com/posts/3742
Case 3. 65 yo woman with annular plaque on left side. https://kikoxp.com/posts/3743
Case 4. 75 yo man with ulcerated erythematous nodule on scalp. https://kikoxp.com/posts/3744
Case 5. 50 yo man with ulcerated firm nodule on shin. https://kikoxp.com/posts/3745
Case 6. 25 yo woman with ulcerated nodule on toe. https://kikoxp.com/posts/3746
Case 7. 5 yo boy with subcutaneous nodule on scalp. https://kikoxp.com/posts/3747
Case 8. 30 yo diabetic man with subcutaneous nodule on posterior neck. https://kikoxp.com/posts/3748

***SPOILER ALERT***
If you want to do these as unknowns, look at all of the cases above first. When you are ready to view the answers, click here https://kikoxp.com/posts/5372 for a list of the diagnoses. Or grab some popcorn and just watch the whole video: https://kikoxp.com/posts/3831. ;-)

A complete organized library of all my videos, digital slides, pics, & sample pathology reports is available here: https://kikoxp.com/posts/5084 (dermpath) & https://kikoxp.com/posts/5083 (bone/soft tissue sarcoma pathology).