Differential Diagnosis for Brown Hyperpigmentation on Stomach
Single Most Likely Diagnosis
- Melasma: This is a common condition characterized by patches of brown hyperpigmentation, often on the face, but can also occur on the stomach, especially in pregnant women or those taking hormonal contraceptives. It's caused by hormonal changes and sun exposure.
Other Likely Diagnoses
- Post-Inflammatory Hyperpigmentation (PIH): This condition occurs after inflammation or injury to the skin, leading to brown hyperpigmentation. It can be caused by various factors, including acne, burns, or skin infections.
- Café-au-Lait Macules: These are benign spots or patches of light brown to dark brown color, which can appear anywhere on the body, including the stomach. They are often present at birth or appear during childhood.
- Linea Nigra: A dark line that runs from the navel to the pubic bone, commonly seen during pregnancy due to hormonal changes.
Do Not Miss Diagnoses
- Addison's Disease: A rare endocrine disorder where the adrenal glands do not produce enough cortisol and aldosterone. One of the symptoms is hyperpigmentation, which can appear as brown or dark spots on the skin, including the stomach.
- Malignant Melanoma: Although rare, it's crucial to consider skin cancer, especially if the hyperpigmentation is asymmetric, has irregular borders, or is changing in size or color.
Rare Diagnoses
- Erythema Dyschromicum Perstans: A rare skin condition characterized by brown or grayish-brown hyperpigmentation, often on the face, neck, and trunk.
- Fixed Drug Eruption: A condition caused by an adverse reaction to certain medications, resulting in brown hyperpigmentation at the site of the reaction.
- Phytophotodermatitis: A rare condition caused by contact with certain plants and subsequent sun exposure, leading to brown hyperpigmentation.