What skin disease is this?

Based on the images provided, the dark patches on the hand and forearm appear to be superficial discoloration consistent with dirt, mud, or an external stain. Here's why: • The patches have irregular shapes and borders, which is typical of something applied externally rather than a dermatological condition originating within the skin. • The skin texture within the dark areas does not show signs of inflammation, scaling, blistering, or significant textural changes that are commonly associated with most skin diseases. • The underlying skin appears to be of normal color and texture where the dark patches are absent. Therefore, this appearance does not strongly suggest a specific skin disease. For any persistent or concerning skin changes, it is always best to consult a healthcare professional for a proper examination and diagnosis. What's next? 📸