Which condition is associated with pigmentation irregularities on the skin?

Chloasma, also known as melasma, is a skin condition characterized by the presence of brown or gray-brown patches on the skin, particularly on the face. It results from an increase in melanin production, often influenced by hormonal changes, such as those occurring during pregnancy or from hormonal therapies, as well as sun exposure. This condition illustrates pigmentation irregularities due to its distinct discoloration in comparison to the surrounding skin.

In contrast, the other options do not specifically relate to pigmentation irregularities. Athlete's foot is a fungal infection that primarily affects the feet and does not involve changes in skin pigmentation. Impetigo is a highly contagious bacterial skin infection, typically displaying symptoms such as sores, blisters, or crusts, rather than pigmentation changes. A dermatophyte infection refers to a fungal infection affecting the skin, hair, or nails, and while it can cause redness, scaling, or peeling, it does not specifically result in pigmentation irregularities like chloasma does.