Problem periods. Itâs common to have cramps or feel uncomfortable when you have your period. And itâs common to sometimes have periods that donât come on a regular schedule when you first start getting them.
Nevus sebaceous on the scalp. Nevus sebaceus or sebaceous nevus (the first term is its Latin name, the second term is its name in English; also known as an Organoid nevus and Nevus sebaceus of Jadassohn) is a congenital, hairless plaque that typically occurs on the face or scalp.
Medical Definition of Sigmoid. Sigmoid: In human anatomy, the lower colon (the lower portion of the large bowel). Sigmoid is short for sigmoid colon. From the Greek letter sigma, which is shaped like a C. Sigmoid also means curved in two directions like the letter S. For example, a sigmoid curve is an S-shaped curve. Search MedTerms: