Fig. 5. A and B, Typical examples of occult sarcoid. The cardinal features include a roughly circular shape, sparse hair coat density (or over alopecia), scaling and at least one nodule within the region (which may only be palpable and not visible).
few, several or hundreds are common. The nodules usually lie under apparently normal skin and then may be freely movable. However, sometimes there are dermal and deep attachments, which prevent in- dependent movement of the overlying skin and/or movement of the tumor mass relative to deeper tissue.
The overlying skin may become thin over larger nod- ules and when these ulcerate, they quickly become more aggressive fibroblastic type tumors. Coalescent nodules of both the major types (see below) are com- mon and often there are large numbers of interlinked nodules.
Fig. 6. The verrucose sarcoid has a warty appearance (A–D) and early lesions in particular may have an occult margin (“halo”; panel E). They can be extensive/coalescent and multiple lesions are common (F).
