Flat warts are caused by infection of the upper skin layers with human papillomavirus (HPV), usually low‑risk types. Most people carry HPV, but warts only appear when additional factors like reduced immunity, skin damage, or poor skin care make it easier for the virus to trigger growths.
Flat warts are considered safe in terms of cancer risk and almost never turn malignant. The main issues are cosmetic discomfort, possible bleeding or soreness if they are repeatedly traumatized, and the tendency to spread or multiply on the skin.
Flat warts can be removed with gentle methods like laser, liquid nitrogen (cryotherapy), radio wave surgery, or electrocoagulation. In some cases, surgical excision with histology is used, especially if the diagnosis is unclear. Self‑cutting, burning, or picking warts is unsafe and can cause bleeding, infection, scarring, and misdiagnosis. Even after removal, new warts can appear, so follow‑up and prevention are important.
You can reduce the risk of flat warts by protecting your skin from chronic irritation, keeping good personal hygiene, and treating infections and metabolic diseases in time. Strengthening immunity, using sun protection, and avoiding unnecessary UV or radiation exposure also help. Regular self‑checks and early visits to a dermatologist for changing lesions are key.
See a dermatologist if you notice new flat, multiple bumps that look like warts, especially on the hands or face, or if existing warts change, bleed, or get injured often. Routine check‑ups are useful for people with many warts, weakened immunity, or other skin tumors.
Flat warts are usually not urgent and can be evaluated at a planned dermatologist visit. Seek earlier medical attention if a lesion changes quickly, bleeds without clear injury, becomes painful, or looks very different from your other warts.