vascular vs.
| • | cavernous hemangioma (blue rubber bleb nevus syndrome) |
| • | glomus tumor |
| • | maculae cerulae |
| • | angiokeratomas |
adnexal vs.
| • | apocrine hydrocystoma |
| • | eccrine spiradenoma |
| • | pilomatricoma |
deposition vs.
| • | argyria |
dermal melanocytosis
| • | blue nevus |
| • | nevus of Ota |
|
minocycline can cause blue pigment (esp. legs or gums)