You are 26 year oldthere is round black patch in your hand and the will stay for 15 to 20 days after it went out you looking same since more then 2 years come?

If you have a round, black patch on your hand that has persisted for more than two years, it is important to see a doctor to determine the cause.

There are a number of possible causes for a round, black patch on the hand, including:

- Melanoma: Melanoma is a type of skin cancer that can develop from melanocytes, which are cells that produce pigment. Melanoma can appear as a round, black patch on the skin, and it can be dangerous if not treated early.

- Nevus: A nevus is a mole, and it is a common skin growth. Nevi can be various colors, including black, brown, or pink. Nevi are usually harmless, but some can develop into melanoma.

- Seborrheic keratosis: Seborrheic keratosis is a non-cancerous skin growth that is common in older adults. Seborrheic keratoses can appear as round, black patches on the skin, and they can be itchy or scaly.

- Dermatofibroma: A dermatofibroma is a small, firm, round nodule that can appear on the skin. Dermatofibromas are usually harmless, but they can sometimes be painful.

- Hemangioma: A hemangioma is a type of birthmark that is caused by an overgrowth of blood vessels. Hemangiomas can appear as round, red or purple patches on the skin, and they can be raised or flat. Hemangiomas are usually harmless, but they can sometimes cause problems such as bleeding or pain.

If you have a round, black patch on your hand that has persisted for more than two years, it is important to see a doctor to determine the cause. The doctor may perform a biopsy of the patch to rule out melanoma or other serious conditions.