People with darker skin are particularly vulnerable to nail tumors' risks because discolorations on or under the nail may be considered normal and go ignored. The most serious nail tumor, melanoma, may look like a brown, black, or grey line or streak on or underneath the nail. Dr. Morrison, along with Sylvester’s team of dermatological oncologists, treat malignant nail tumors, such as:melanomasquamous cell carcinoma (or Bowen’s disease)onychocytic carcinomaCommon benign (non-cancerous) nail tumors include:onychopapillomanevus (moles)lentigoonychomatricomaglomus tumorAre these tumors contagious to others? “More research will need to be done in this area to confirm any true benefit.”What is the treatment for nail tumors? “Excision of the complete nail matrix (the cells that make up the hard part of the nail) may result in permanent nail dystrophy (like a split nail).