Tycoon’s cap (also known as acne necrotica miliaris) is a human disease of the scalp, classified as a mixed alopecia, characterized by minute, itchy pustules within the scalp.
See also Skin lesion Cicatricial alopecia
References
Further reading Freedberg, et al. (2003) Fitzpatrick's Dermatology in General Medicine. (6th ed.) McGraw-Hill. .