(a) The dermis contains a mild focal lymphohistiocytic infiltrate. H&E, ×100. (b) Degenerative and inflammatory changes affecting the marginal chondrocytes with loss of basophilia and poor alcian blue staining of the cartilaginous tissue. H&E, ×40. (c) The inflammatory cells infiltrate, including lymphocytes, plasma cells, and histiocytes, infiltrate the degenerative cartilage. H&E, ×100.
