Why does a black mole suddenly bulge?

It is normal to have black moles on the skin. Some people have had them since childhood and there has been no change. Some people develop them later. But why does a black mole suddenly appear? If there is no change in the usual way, but a bulge occurs, it means that the mole has grown, which will also send a signal of the disease, so go to the hospital for examination as soon as possible, and it is best to remove such moles in time.

1. What happened to the sudden bulge of the mole?

Black moles are considered to be pigmented moles, which are caused by abnormal skin metaplasia and melanin deposition. The raised and itchy skin indicates signs of growth. It is recommended that you go to a regular hospital's dermatology department for a check-up and, if necessary, receive laser or surgical treatment to prevent cancer. Pay attention to local cleanliness and hygiene at ordinary times.

2. What is a pigmented nevus?

Pigmented nevus is a benign neoplasm composed of nevus cells, also known as nevus cell nevus, cellular nevus, melanocytic nevus, and nevus. This disease is common and occurs in almost everyone, from infancy to the elderly. The number of cases increases with age, and often increases significantly during puberty. Women tend to have more moles than men, and white people tend to have more moles than black people. Occasionally seen on mucosal surfaces. There are various types of clinical manifestations. The color is mostly dark brown or ink black, and a few are colorless.

3. Differential diagnosis of pigmented nevus

Childhood junctional nevus should be differentiated from lentigo and freckles. Compound nevi and intradermal nevi should be differentiated from seborrheic keratosis, pigmented basal cell carcinoma, dermatofibroma, neurofibroma, etc. The differential diagnosis from malignant melanoma is that the latter is often asymmetric, has unclear boundaries, rough edges, and uneven colors. The tumor grows rapidly, is easy to rupture and bleed, and can form irregular scars. The tumor cells are often abnormal.

4. Treatment of pigmented nevus

Reduce friction and external factors that damage the mole. Except for cosmetic reasons, no treatment is generally required. Pigmented nevi occurring on the palms, soles, waist, armpits, groin, shoulders and other areas prone to friction should be closely observed, especially those with irregular edges, uneven colors and a diameter ≥1.5 cm. If it is found to be rapidly expanding, partially rising, ulcerating, or bleeding, it should be removed promptly. For larger lesions, surgical excision and skin grafting are performed; for smaller and superficial lesions, carbon dioxide laser treatment can be given. The treatment must be thorough, otherwise residual nevus cells are prone to recurrence.