Mass on the back with back pain Ultrasound shows an ill-defined hypoechoic area that measures 1.9 x 2.1 x 1.2 cm in the subcutaneous tissue involving the dermis without peripheral blood flow which could represent an infected sebaceous cyst or epidermal inclusion cyst.
Superficial hypoechoic subcutaneous lesion involving the dermis which could represent an infected sebaceous cyst or epidermal inclusion cyst. Clinical correlation is recommended.