Another cancer causing lesion that can occur on the feet are called Actinic Keratosis. Although most commonly found in sun-exposed areas of the body such as the face, ears, and back of the hands, these lesion can also occur on the foot. They are characterized as either flat or elevated with a scaly surface. They can either be reddish or skin colored. On the foot they are frequently mistaken for plantars warts. These lesions are the precursor of epidermoid carcinoma. Treatment for these lesions should be through as they are definitely precancerious. Treatment consists of freezing the lesions with liquid nitrogen or sharp excision.
Yet another cancerous lesion that can occur on the foot is called Kaposi's Sarcoma. These lesions occur most commonly on the soles of the feet They are irregular in shape and have a purplish, reddish or bluish black appearance. They tend to spread and form large plaques or become nodular. The nodular lesions have a firm rubbery appearance. The appearance of these lesions is an ominous sign. In the late 1970's and early 1980's an outbreak of Kaposi's sarcoma occurred in San Francisco, California. It was later learned that the disease was associated with AIDS infection. It can occur without the concurrent AIDS infection but this is very rare.
Chronic athlete's foot can cause an increased pigmentation to the bottom of the foot. It is associated with dry scaling skin and may have a reddish appearance.
Generalized increased pigmentation occurs for a variety of other reasons. Dark patches of skin occur about the ankles and lower legs in persons who suffer from Venous Stasis. Venous stasis is caused by an accumulation of fluid in the lower extremities. This is due to poor venous return of blood to the heart. Venous blood flow back to the heart occurs by way of the veins in the feet and legs. Venous stasis is associated with varicose veins that do a poor job of returning blood to the heart. As a result the blood flow is slowed, becomes stagnant, and fluid accumulates in the ankles and lower legs. As the fluid accumulates in the lower legs, the small and medium-sized veins break or leak fluid into the tissues. As blood cells break up in the tissue, they deposit the iron that is part of hemoglobin in the blood cell. The iron stains the skin causing a light to dark brownish appearance. With time, the skin and subcutaneous fat becomes thinned and will break down creating weeping venous stasis ulcerations. At times, blistering will form with a clear, watery fluid weeping from the skin. This condition requires professional attention by a physician.
Another cause of generalized increased pigmentation is diabetes. The condition termedDiabetic Dermopathy occurs most frequently on the shins and lower legs. They may have the appearance of small scars. Their appearance may precede the diagnosis of diabetes by several years. The actual cause of diabetic dermopathy is not well understood, but it does not cause any particular problem or pose any particular health threat.
Small, spider-like areas of increased pigmentation on the ankles are caused by the break down of small veins in the area and are called Spider Veins; they also pose no health risks.