Eccrine hidrocystomas are benign tumors of sweat gland origin and are classified into 2 major groups: the Smith type, which is the most prevalent solitary type, and the Robinson, or multiple, type. They are typically dome-shaped, have an amber, brown, or bluish tint, and range from 1 to 6 mm in diameter. During hot or humid weather, these lesions will grow in size and/or multiply in number. Eccrine hidrocystomas usually do not involve the eyelid margin but rather are distributed around the eyelid skin; this, along with a lighter color presentation, typically differentiates it from the apocrine type.
The clinical presentation of apocrine hidrocystomas is very similar to that described above. They appear as dome-shaped, solitary, clear, cystic nodules with a smooth surface, and the color varies, ranging from flesh-colored to blue-black. Although the solitary hidrocystoma is the most common clinical presentation, multiple lesions on the face and neck have been reported. The cysts tend to stay asymptomatic and will follow a gradual course until a certain size is reached. There is no evidence of seasonal variations associated with apocrine hidrocystoma, whereas patients tend to present with eccrine hidrocystomas mostly during hot, humid weather. The Table delineates the distinctions between the 2 types of hidrocystomas, as well as the similarities.
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Cite this: Hidrocystomas - A Brief Review - Medscape - Sep 05, 2006.