Which of the following is NOT one of the classic Kanavel signs indicative of acute infectious flexor tenosynovitis of the hand?

Explanation:
The four classic Kanavel signs of flexor tenosynovitis are: (1) fusiform (sausage-like) swelling of the digit, (2) resting posture in flexion, (3) tenderness along the course of the flexor tendon sheath, and (4) pain with passive extension. Erythematous streaking into the forearm is a sign of lymphangitis, not a primary sign of localized flexor tenosynovitis. Reference: Green's Operative Hand Surgery, 8th Edition.