In dermatopathology, the<unk> , also<unk>  smear, is scraping of an ulcer base to look for<unk>  cells.  It is sometimes also called the Chickenpox skin<unk>  and the herpes skin<unk> . The<unk>  is named after Arnault<unk>  (1886-1954), a Russian dermatologist. Atypical<unk>  cell is a large round keratinocyte with a hypertrophic nucleus, hazy or absent nucleoli, and abundant basophilic cytoplasm. The basophilic staining is deeper peripherally on the cell membrane due to the cytoplasm's tendency to get condensed at the periphery, leading to a perinuclear halo.<unk>  cells commonly are found in: herpes simplex, varicella, herpes zoster and pemphigus vulgaris.
Tzanck test
Pathergy test
Patrick's test
Heaf test
Allen's test
Ascheim-Zondek test
Breusch-Pagan test
Fluorescent treponemal antibody absorbtion 