Primary basal cell carcinomas are classified as superficial, nodular, micronodular, and morpheic/infiltrative. Anatomical and histological characteristics of the basal cell carcinomas subtypes vary with each classification. This month’s Mohs Case presentation is a micronodular basal cell carcinoma. Micronodular basal cell carcinoma may be more difficult to eradicate and prone to recurrence than nodular subtype. Micronodular basal cell carcinoma is thought to have a greater potential for clinically surreptitious tumor spread compared with the majority of basal cell carcinomas that are nodular. They also have wider and deeper tumor extensions than nodular basal cell carcinomas of similar clinical size. The number of surgical stages required for complete removal of tumor, the width of tissue required to remove subclinical extension of tumor, and the depth of defect at completion all tend to be greater with micronodular basal cell carcinomas when compared with nodular basal cell carcinomas regardless of whether cases were primary or recurrent. All of that to say, micronodular BCCs can be significantly more destructive than nodular BCCs because tumor extension is difficult to detect clinically. When treating micronodular BCC, clinicians should keep in mind its potential for clandestine invasion.