I found a hard painless lump on my back and has been there for years, I recently squeezed it hard and a dark brown/brown moist substance came out which has left a sore on my back. What could be the cause? It was on my spine area. Could it have penetrated my spine? How can I avoid a reoccurence? It has left a sore that Im treating at the moment.
Hello, You probably had a sebaceous cyst which occurred due to a blocked hair follicle. However, to confirm that please meet a surgeon or a dermatologist. It is the lump is not completely removed it may reoccur, however it will not penetrate into the spine. Meet your local doctor a definite diagnosis.