Hello, I Have A Small Red Spot On The Side

Hello, I have a small red spot on the side of the head of my penis. The spot is not swollen, itchy, or pain full. The last time I had unprotected sex was over 2 months ago. What could it be? It been there for abt week, prior to it forming I have been excessively masturbating, often without lotion, since it's formed I haven't been as much and it has started going away since then