Causes of skin growths can include melanoma, cysts, folliculitis, lipoma and neurofibromas, explains WebMD. Some skin conditions that result in growths such as seborrheic keratoses and keratosis pilaris are harmless, not requiring any medical intervention.
Growths can occur as moles and soft-tissue tumors when skin cells grow abnormally, states WebMD. These skin conditions can be harmless, but in some cases such as large moles or assymetrical growths, they can become cancerous and require removal. Moles that change color, size and shape require immediate evaluation by a dermatologist, as they can be a sign of melanoma. Soft tissue tumors or lipomas, while often harmless because they don't grow, can put pressure on nerves and require removal.
Skin tags are skin growths attached to the skin with stalks that can occur during sudden weight gain, states WebMD. They can be removed but are not harmful. Keratin-producing cells can produce raised, dark growths called seborrheic keratoses. Although they resemble moles and can be unattractive, they are not harmful. Keratosis pilaris produces horny skin bumps that occur in the young and usually in dry environments or weather. They can resolve on their own or be helped along with a thorough regimen of exfoliating and moisturizing the skin.