Histologic lesions associated with Dermacentor albipictus infestation on deceased yearling male elk (Cervus canadensis) found in Clearfield County, Pennsylvania, USA, in 2017. (A) Photomicrograph showing epidermal ulceration (U) and hyperkeratosis (H) with serocellular crust formation. (B) The subjacent dermis is multifocally infiltrated by neutrophils admixed with lymphocytes, plasma cells, and fewer eosinophils.