<prompt> All are nail changes seen in cases of psoriasis except:Subungual hyperkeratosisThimble pittingMees linesOil drop sign  <response>: Mees lines - seen in Arsenic poisoning Nail changes in psoriasis - MC - Nail pittingThimble pitting Most characteristic - oil drop sign salmon patch Onycholysis Leukonychia Subungual hyperkeratosis Nail tunnel 