Introduction Deep space infections defined as infections of the thenar space most commonly infected hypothenar space midpalmar space rare Collar button abscess an abscess that occurs in the web space between fingers Anatomy Thenar space a bursa (potential space) just palmar to adductor pollicis and dorsal to flexor tendons separated from midpalmar potential space by a fascial septum Midpalmar space located dorsal and radial to hypothenar space Hypothenar space located palmar to fifth metacarpal, dorsal and radial to hypothenar fascia, ulnar to hypothenar septum Presentation History may or may not have penetrating trauma Symptoms pain swelling Physical exam pain with flexion of fingers thenar pain with thumb flexion hypothenar pain with small finger flexion midpalmar pain with middle, ring, and small finger flexion thenar and midpalmar spaces often have loss of palmar concavity secondary to swelling Imaging Radiographs indicated if there is suspicion for a foreign body MRI indications help define extent of infection Treatment Operative incision and drainage in conjunction with IV antibiotics indications standard of care for deep space infections and collar button abscesses technique use volar and dorsal incisions for collar button abscesses avoid skin in actual web space