pileolus
pɪˈloʊləs
Definitions
1. noun
A small hat or cap, especially one worn by a monarch or bishop
“The monarch’s pileolus was adorned with precious gems.”
2. noun
A small, usually cylindrical, growth on the scalp, often a symptom of a fungal infection
“The doctor examined the patient’s scalp for signs of a pileolus.”