Wen is a cyst (growth) in the skin. The skin contains sebaceous glands that secrete oil to lubricate the skin. A wen forms when these secretions collect inside a sebaceous gland. Wens may appear on any part of the skin except the soles of the feet or the palms of the hands. Wens usually appear on the scalp, face, or shoulder. They grow slowly, forming round or oval lumps, from the size of a pea to that of a walnut. Wens are soft and painless. They hold a yellowish-white matter, which may have a rancid odor. Wens may become infected, causing inflammation and pain. Any lump or growth in the skin should be seen promptly by a doctor.
