Dark spots that appear on your mouth or lips have severalcauses. By far, the most common cause is known as a melanotic macule or non-cancerous hyperpigmentation of a mucous membrane. This occurs when one of your mucous membranes produces more pigment (melanin) than typical. Your lesion may ...
Gastrointestinal (GI)bleedingis a symptom of a disorder in your digestive tract. The blood often appears in stool or vomit but isn't always visible, though it may cause the stool to look black or tarry. The level of bleeding can range from mild to severe and can be life-threatening. Wh...
On clinical examination, an irregular pigmented macule of two colours was seen (Figure 1). Differential diagnoses included solar lentigo, flat seborrhoeic keratosis, pigmented actinic keratosis and, most importantly, recurrent lentigo maligna.P. Guitera...
Magnetite is a natural magnetic mineral. The spinning Earth core generates a magnetic field. Alnico magnets are made of aluminum, nickel and cobalt with smaller amounts of aluminum, copper and titanium. Ceramic or ferrite magnets are made of either barium oxide or strontium oxide alloyed with iro...
The melanotic macule should be small, flat, and darker than the surrounding tissue. If it appears suddenly, changes size, or starts to roughen, it may be malignant. A doctor can examine the spot and rule out possible causes to determine if a biopsy is necessary. If the patient is taking...