Causes

There are several different causes of dark spots, as we describe here:

Sun damage

Also called sunspots, solar lentigines, or liver spots, people can develop dark spots on their skin after being exposed to the sun or tanning beds.

Areas of the body that receive the most sun exposure, such as the face, hands, or arms, are most likely to develop sun spots.

Hormonal changes

Melasma is a skin condition that leads to small patches of skin discoloration. The condition is more common in women, especially during pregnancy.

According to the American Academy of Dermatology, hormones may trigger melasma.

Medication side effects

Certain medications can increase skin pigmentation and lead to dark spots. The most common culprits are non-steroidal anti-inflammatory drugs (NSAIDs), tetracyclines, and psychotropic drugs.

Inflammation

Dark spots can develop after a bout of inflammation on the skin. Inflammation may occur for various reasons that include eczema, psoriasis, injury to the skin, and acne.

Wound healing

Dark spots may remain after an insect bite, burn, or cut heals. These may fade with time.

Irritation

Cosmetic skin or hair products can irritate the skin, causing dark patches to form.

Diabetes

Diabetes can cause areas of the skin to become darker.

Conditions associated with diabetes include acanthosis nigricans, which causes darkened, velvety skin, and shin spots or diabetic dermopathy, which people may confuse with age spots.

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