Enlarge Thumb Nodule

A 39-year-old carpenter came to the clinic complaining of swelling and pain in his thumb. He noticed the lump about six months ago, but it has slowly increased in size over time. He denies any trauma or injury to the thumb. The lump was painless initially, but he has recently started experiencing mild discomfort, especially when using his thumb for gripping activities. On examination, a solitary, slightly mobile, dome-shaped nodule approximately 1 cm in diameter is seen on the volar aspect of the left thumb, just proximal to the interphalangeal joint and was tender to palpation. The skin overlying the nodule was unremarkable, without any signs of inflammation, as shown in the image. The range of motion of the thumb is slightly limited due to pain. Based on the patient’s history and physical examination.