What is the X in X-mas?
late 14c. (early 14c. as a surname), of unknown origin; perhaps related to Old English pipligende "having shingles;" also cf. Latin papula, papilla (see pap (n.2)). As a verb from c.1600. Related: Pimples.
pimple pim·ple (pĭm'pəl)
A small red swelling of the skin, usually caused by acne.
The head (1818+)