Wheal /(?)/

Wheal

n.
  1. A pustule; a whelk.

Wheal

n.
  1. A more or less elongated mark raised by a stroke; also, a similar mark made by any cause; a weal; a wale.
  2. Specifically (Med.), a flat, burning or itching eminence on the skin, such as is produced by a mosquito bite, or in urticaria. (Med.)

Wheal

n.
  1. A mine. (Mining)