I have desquamative inflammatory vaginitis and am currently be treated by a specialist. I am being treated with topical estrogen externally. Tonight, I discovered a dime sized hard painful lump on my labia minora. I have never had anything like this before. It is smooth without a head, not discolored, and doesn't move under the skin. It is painful to the touch. What is this? I am STD free and am in a monogamous relationship. Is this a cyst, a boil, a side effect of the estrace...