papula

from The Century Dictionary.

• noun In medicine, a small inflammatory elevation of the skin not containing liquid visible to the naked eye; a pimple.
• noun In anatomy and zoology, same as papilla.
• noun plural In Stelleroidea, same as dermal branchiæ.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Med.) A pimple; a small, usually conical, elevation of the cuticle, produced by congestion, accumulated secretion, or hypertrophy of tissue; a papule.
• noun (Zoöl.) One of the numerous small hollow processes of the integument between the plates of starfishes.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine A pimple; a small, usually conical, elevation of the cuticle, produced by congestion, accumulated secretion, or hypertrophy of tissue; a papule.
• noun zoology One of the numerous small hollow processes of the integument between the plates of starfishes.