There is a small hole under the skin; it hurts when pressed.

There may be a small hole under the skin, and pain upon touching it could be caused by sebaceous cysts, trauma, corns, or other reasons. Improvement can be achieved through medication or surgical treatment. Specific analyses are as follows:

1. Sebaceous Cyst

If excessive sebum is secreted by sebaceous glands, local accumulation of sebum may occur, forming a sebaceous cyst. At this time, a small hole may appear under the skin, accompanied by symptoms such as pain and foul odor. In such cases, improvement can be achieved by following a doctor's advice to undergo sebaceous cyst excision surgery.

2. Trauma

If the skin suffers a needle-like injury in daily life, a small hole may form under the skin, causing pain when touched. For this condition, it is recommended to use antiseptics such as iodophor, mupirocin ointment, fusidic acid cream, etc., under medical guidance.

3. Corn (Clavus)

Corns result from long-term friction and pressure on the feet leading to hyperplasia of the stratum corneum. Contributing factors include occupational demands and foot bone deformities. If affected by this condition, individuals may experience the aforementioned symptoms. Most cases can be relieved under medical supervision using treatments such as cryotherapy or laser therapy.

Besides the above-mentioned causes, many other conditions—such as athlete’s foot, plantar warts, and boils—can also cause similar symptoms. Patients should seek timely medical evaluation to identify the exact cause and actively cooperate with treatment to avoid delaying recovery.