What Causes Black Marks on the Palm?

Whenever any medical condition arises, it often manifests through certain abnormal physical symptoms. Therefore, in daily life, it is essential to pay close attention to changes in your body. For instance, if you notice dark discoloration on your palms, what could be causing it? Let’s explore the possible reasons below.

What Causes Dark Discoloration on the Palms?

1. Cold weather may cause dark discoloration on the palms. In low temperatures, blood circulation slows down, leading to impaired blood flow—this can result in a bluish-black or darkened appearance of the palms.

2. Dark discoloration may also stem from traumatic bruising (hematoma). Following an injury to the hand, blood may not pool immediately but gradually accumulates beneath the skin of the palm. As the hematoma enlarges, the palm may appear dark or blackish. During this process, swelling, pain, and numbness in the palm may also occur.

3. Dark discoloration on the palms can sometimes be associated with back muscle injury, which may damage spinal nerves and trigger non-organic (functional) heart disease—a condition that, in rare cases, may present with palmar hyperpigmentation.

4. Another possible cause is *palmar tinea nigra*, a superficial fungal infection. It typically presents as well-demarcated, non-scaly, brownish-black macules on the palms—often solitary at onset. Lesions usually begin as light brown patches and progressively darken to a deep brown or black, occasionally with slightly darker, scaly borders. While most common on the palms and fingers, it may also involve the soles, neck, and chest.

The above outlines potential causes of dark discoloration on the palms. We hope this information is helpful to you.