Which skin condition results in increased pigment on the skin?

Chloasma, also known as melasma, is a skin condition characterized by the development of dark, discolored patches on the skin, most commonly on the face. It occurs due to an overproduction of melanin, the pigment responsible for the color of the skin. This condition is often triggered by hormonal changes, such as those that occur during pregnancy or from the use of oral contraceptives, as well as from sun exposure and skin inflammation.

In contrast, psoriasis is an autoimmune condition leading to the rapid proliferation of skin cells, resulting in thick, scaly patches but not specifically increased pigment. Eczema, or atopic dermatitis, primarily involves inflammation and does not typically cause a consistent increase in skin pigmentation. Rosacea is a chronic skin condition characterized by facial redness, visible blood vessels, and sometimes pimples, but it does not increase pigmentation in the same manner that chloasma does. Thus, chloasma is the skin condition directly associated with increased pigment on the skin.