It could be a couple of diff't conditions. It could be a blood blister just below the surface of the skin. Or if it's on the bottom of the toe, it could be the introduction of a plantar wart. There's a few good websites that can go into further description with pics of a plantar wart. If it turns out to be that, treat it sooner than later - it can spread and be painful.
It could be a freckle, mole or solar lentigene. Sun spots or lentigines, are harmless, flat, brown discolorations of the skin which usually occur on the back of the hands, neck and face of people and are caused by the skin being exposed to the sun. The only way to prevent age spots is to use liberal amounts of sunscreen before the age of forty, avoid the sun, and wear protective clothing. The newest treatment for age spots is an alpha hydroxy acid gel or beta hydroxy acid gel. Retin-A cream, alpha hydroxyacid peels, and liquid nitrogen therapy are other options.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
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