Plica neuropathica (also known as "Felted hair") is a curling, looping, intertwisting, and felting or matting of the hair in localized areas of the scalp.

Polish plait (Plica polonica in Latin) is a formation of hair.

He gave, from his own observations, the first description of the "plica polonica," as well as many local symptoms and newly discovered medicinal herbs.

Freidli A, Peerriard-Wolfensberger J, Harms M. Plica polonica in the 21st century.

He was elected a Fellow of the Royal Society in 1743, but his only contribution to the Society's Philosophical Transactions was a letter relating to a case of plica polonica in 1747.

Pushpa Gnanaraj MD, V. Venugopal MD, C. N. Pandurangan MD (2007) Plica polonica in association with pediculosis capitis and scabies - a case report.