Demodex-induced follicular mucinosis of the head and neck mimicking folliculotropic mycosis fungoides

Follicular mucinosis (FM) is a cutaneous disorder arising from the pilosebaceous unit that is most strongly associated with folliculotropic mycosis fungoides (FMF), an aggressive form of mycosis fungoides (MF). Demodicidosis is a cutaneous infection caused by Demodex, an ectoparasitic mite that permanently resides in or near the pilosebaceous unit of mammalian hair follicles. Demodicidosis can have a variety of presentations including rosacea-like demodicidosis, pityriasis folliculorum, and demodicidosis gravis.