It sounds like the blackish-brown spots on your lower legs and feet could be related to changes in skin pigmentation often seen in people with borderline diabetes and blood pressure issues. These spots might be due to a condition called diabetic dermopathy or related vascular changes, which are usually harmless but indicate underlying circulation or metabolic concerns.

• Since you have borderline diabetes and are on blood pressure medication, it’s important to have a thorough evaluation by a dermatologist or an endocrinologist to confirm the cause.
• Treatment often focuses on managing the underlying diabetes and blood pressure well, along with skin care. Topical creams like corticosteroids (e.g., Momate-XL Cream) might be prescribed if inflammation is present, but they should only be used under medical supervision.
• Avoid self-medicating and protect your skin from injury or excessive sun exposure, which can worsen pigmentation.
• Regular monitoring of blood sugar and blood pressure is essential to prevent progression.
• If you notice any new symptoms like pain, swelling, ulceration, or rapid changes in the spots, seek medical attention promptly.

Please consult a dermatologist or your endocrinologist for a personalized assessment and appropriate treatment plan. If you want, I can explain more about diabetic skin changes or how blood pressure affects skin health.To narrow down potential causes, we will need some more information.I understand you're concerned about the blackish-brown spots on your legs and feet. Please tell me your age and gender.